高三月考难度数据导入

This commit is contained in:
WangWeiye 2023-05-17 12:16:03 +08:00
parent 9fac56fa4e
commit c4906d2d4f
4 changed files with 855 additions and 291 deletions

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ans
usages
017223
20230517 2023届高三01班 0.971
20230517 2023届高三02班 0.969
20230517 2023届高三03班 0.966
20230517 2023届高三04班 0.967
20230517 2023届高三05班 1.000
20230517 2023届高三06班 0.974
20230517 2023届高三07班 0.970
20230517 2023届高三08班 1.000
20230517 2023届高三09班 0.933
20230517 2023届高三10班 0.973
20230517 2023届高三11班 1.000
20230517 2023届高三12班 0.958
017224
20230517 2023届高三01班 0.971
20230517 2023届高三02班 1.000
20230517 2023届高三03班 0.966
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20230517 2023届高三06班 0.949
20230517 2023届高三07班 0.970
20230517 2023届高三08班 1.000
20230517 2023届高三09班 1.000
20230517 2023届高三10班 1.000
20230517 2023届高三11班 0.950
20230517 2023届高三12班 1.000
017225
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20230517 2023届高三05班 0.947
20230517 2023届高三06班 0.949
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20230517 2023届高三09班 0.767
20230517 2023届高三10班 0.838
20230517 2023届高三11班 0.850
20230517 2023届高三12班 0.833
017226
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20230517 2023届高三04班 1.000
20230517 2023届高三05班 0.974
20230517 2023届高三06班 0.974
20230517 2023届高三07班 1.000
20230517 2023届高三08班 1.000
20230517 2023届高三09班 0.933
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20230517 2023届高三11班 1.000
20230517 2023届高三12班 0.958
017227
20230517 2023届高三01班 1.000
20230517 2023届高三02班 1.000
20230517 2023届高三03班 1.000
20230517 2023届高三04班 0.967
20230517 2023届高三05班 1.000
20230517 2023届高三06班 0.949
20230517 2023届高三07班 0.939
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20230517 2023届高三11班 0.900
20230517 2023届高三12班 0.958
017228
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20230517 2023届高三06班 0.436
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20230517 2023届高三12班 0.458
017229
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20230517 2023届高三12班 1.000
017230
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20230517 2023届高三12班 0.792
017231
20230517 2023届高三01班 0.735
20230517 2023届高三02班 0.500
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20230517 2023届高三08班 0.692
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20230517 2023届高三10班 0.541
20230517 2023届高三11班 0.400
20230517 2023届高三12班 0.542
017232
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20230517 2023届高三06班 0.231
20230517 2023届高三07班 0.333
20230517 2023届高三08班 0.231
20230517 2023届高三09班 0.267
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20230517 2023届高三11班 0.250
20230517 2023届高三12班 0.250
017233
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20230517 2023届高三03班 0.586
20230517 2023届高三04班 0.833
20230517 2023届高三05班 0.737
20230517 2023届高三06班 0.667
20230517 2023届高三07班 0.576
20230517 2023届高三08班 0.731
20230517 2023届高三09班 0.533
20230517 2023届高三10班 0.459
20230517 2023届高三11班 0.400
20230517 2023届高三12班 0.375
017234
20230517 2023届高三01班 0.147
20230517 2023届高三02班 0.062
20230517 2023届高三03班 0.138
20230517 2023届高三04班 0.167
20230517 2023届高三05班 0.053
20230517 2023届高三06班 0.077
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20230517 2023届高三08班 0.038
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20230517 2023届高三11班 0.000
20230517 2023届高三12班 0.000
017235
20230517 2023届高三01班 1.000
20230517 2023届高三02班 1.000
20230517 2023届高三03班 1.000
20230517 2023届高三04班 1.000
20230517 2023届高三05班 1.000
20230517 2023届高三06班 1.000
20230517 2023届高三07班 1.000
20230517 2023届高三08班 1.000
20230517 2023届高三09班 1.000
20230517 2023届高三10班 1.000
20230517 2023届高三11班 1.000
20230517 2023届高三12班 1.000
017236
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20230517 2023届高三02班 0.969
20230517 2023届高三03班 0.966
20230517 2023届高三04班 0.967
20230517 2023届高三05班 0.947
20230517 2023届高三06班 1.000
20230517 2023届高三07班 1.000
20230517 2023届高三08班 1.000
20230517 2023届高三09班 0.967
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20230517 2023届高三11班 1.000
20230517 2023届高三12班 1.000
017237
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20230517 2023届高三02班 0.562
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20230517 2023届高三10班 0.243
20230517 2023届高三11班 0.300
20230517 2023届高三12班 0.375
017238
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20230517 2023届高三08班 0.346
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20230517 2023届高三11班 0.000
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017239
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20230517 2023届高三03班 1.000 0.914
20230517 2023届高三04班 1.000 0.946
20230517 2023届高三05班 1.000 0.984
20230517 2023届高三06班 1.000 0.949
20230517 2023届高三07班 0.985 0.924
20230517 2023届高三08班 1.000 1.000
20230517 2023届高三09班 0.967 0.950
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20230517 2023届高三11班 0.992 0.950
20230517 2023届高三12班 1.000 0.943
017240
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20230517 2023届高三02班 0.984 0.996
20230517 2023届高三03班 0.920 0.922
20230517 2023届高三04班 0.956 0.967
20230517 2023届高三05班 0.939 0.957
20230517 2023届高三06班 0.940 0.888
20230517 2023届高三07班 0.965 0.928
20230517 2023届高三08班 0.981 0.962
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20230517 2023届高三10班 0.973 0.889
20230517 2023届高三11班 0.958 0.894
20230517 2023届高三12班 0.938 0.932
017241
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20230517 2023届高三02班 1.000 0.844 0.672
20230517 2023届高三03班 1.000 0.802 0.713
20230517 2023届高三04班 1.000 0.708 0.706
20230517 2023届高三05班 1.000 0.684 0.811
20230517 2023届高三06班 1.000 0.756 0.791
20230517 2023届高三07班 0.939 0.712 0.742
20230517 2023届高三08班 1.000 0.712 0.660
20230517 2023届高三09班 1.000 0.658 0.783
20230517 2023届高三10班 0.946 0.615 0.761
20230517 2023届高三11班 1.000 0.812 0.758
20230517 2023届高三12班 1.000 0.698 0.812
017242
20230517 2023届高三01班 1.000 0.701 0.228
20230517 2023届高三02班 1.000 0.432 0.129
20230517 2023届高三03班 1.000 0.603 0.250
20230517 2023届高三04班 0.933 0.694 0.242
20230517 2023届高三05班 0.961 0.386 0.062
20230517 2023届高三06班 0.962 0.427 0.122
20230517 2023届高三07班 1.000 0.364 0.000
20230517 2023届高三08班 1.000 0.397 0.087
20230517 2023届高三09班 0.967 0.283 0.058
20230517 2023届高三10班 0.973 0.360 0.057
20230517 2023届高三11班 0.950 0.333 0.019
20230517 2023届高三12班 1.000 0.347 0.099
017243
20230517 2023届高三01班 0.934 0.721 0.070
20230517 2023届高三02班 0.938 0.526 0.020
20230517 2023届高三03班 0.879 0.523 0.017
20230517 2023届高三04班 0.958 0.439 0.004
20230517 2023届高三05班 0.875 0.434 0.007
20230517 2023届高三06班 0.865 0.355 0.035
20230517 2023届高三07班 0.939 0.359 0.000
20230517 2023届高三08班 0.904 0.423 0.029
20230517 2023届高三09班 0.858 0.267 0.013
20230517 2023届高三10班 0.858 0.306 0.024
20230517 2023届高三11班 0.863 0.333 0.006
20230517 2023届高三12班 0.854 0.319 0.005
021639
B

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[BEGIN]
## 20230418
** 2025届高一01班
015269 0.833
015270 0.930
015271 0.977
015272 1.000
015273 0.763
015274 0.667
015275 0.570
015276 0.833
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015279 0.357
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015282 0.763
015283 0.453
015284 0.263
015285 0.940
015286 0.912 0.850
015287 0.976 0.512
015288 0.863 0.502
015289 0.700 0.667 0.025
** 2023届高三01班
017223 0.971
017224 0.971
017225 0.941
017226 0.971
017227 1.000
017228 0.529
017229 1.000
017230 0.824
017231 0.735
017232 0.382
017233 0.853
017234 0.147
017235 1.000
017236 0.941
017237 0.765
017238 0.412
017239 1.000 0.938
017240 0.961 0.985
017241 1.000 0.824 0.833
017242 1.000 0.701 0.228
017243 0.934 0.721 0.070
[END]
[BEGIN]
## 20230418
** 2025届高一02班
015269 0.927
015270 0.950
015271 0.977
015272 0.927
015273 0.780
015274 0.757
015275 0.733
015276 0.780
015277 0.293
015278 0.587
015279 0.340
015280 0.097
015281 0.757
015282 0.610
015283 0.512
015284 0.318
015285 0.943
015286 0.935 0.905
015287 0.966 0.590
015288 0.777 0.465
015289 0.640 0.568 0.022
** 2023届高三02班
017223 0.969
017224 1.000
017225 0.938
017226 1.000
017227 1.000
017228 0.594
017229 0.938
017230 0.781
017231 0.500
017232 0.469
017233 0.719
017234 0.062
017235 1.000
017236 0.969
017237 0.562
017238 0.562
017239 1.000 0.965
017240 0.984 0.996
017241 1.000 0.844 0.672
017242 1.000 0.432 0.129
017243 0.938 0.526 0.020
[END]
[BEGIN]
## 20230418
** 2025届高一03班
015269 0.927
015270 0.977
015271 0.977
015272 0.950
015273 0.830
015274 0.803
015275 0.707
015276 0.707
015277 0.293
015278 0.367
015279 0.243
015280 0.220
015281 0.853
015282 0.803
015283 0.830
015284 0.365
015285 0.979
015286 0.943 0.975
015287 0.964 0.504
015288 0.858 0.542
015289 0.573 0.560 0.003
** 2023届高三03班
017223 0.966
017224 0.966
017225 0.897
017226 0.966
017227 1.000
017228 0.345
017229 0.966
017230 0.897
017231 0.655
017232 0.586
017233 0.586
017234 0.138
017235 1.000
017236 0.966
017237 0.552
017238 0.517
017239 1.000 0.914
017240 0.920 0.922
017241 1.000 0.802 0.713
017242 1.000 0.603 0.250
017243 0.879 0.523 0.017
[END]
[BEGIN]
## 20230418
** 2025届高一04班
015269 0.877
015270 1.000
015271 0.927
015272 0.830
015273 0.877
015274 0.780
015275 0.633
015276 0.780
015277 0.413
015278 0.587
015279 0.463
015280 0.220
015281 0.853
015282 0.853
015283 0.682
015284 0.170
015285 0.965
015286 0.995 0.932
015287 0.930 0.526
015288 0.915 0.564
015289 0.627 0.555 0.005
** 2023届高三04班
017223 0.967
017224 0.967
017225 0.933
017226 1.000
017227 0.967
017228 0.500
017229 0.967
017230 0.833
017231 0.633
017232 0.233
017233 0.833
017234 0.167
017235 1.000
017236 0.967
017237 0.433
017238 0.400
017239 1.000 0.946
017240 0.956 0.967
017241 1.000 0.708 0.706
017242 0.933 0.694 0.242
017243 0.958 0.439 0.004
[END]
[BEGIN]
## 20230418
** 2025届高一05班
015269 0.903
015270 0.977
015271 1.000
015272 0.903
015273 0.853
015274 0.877
015275 0.463
015276 0.757
015277 0.340
015278 0.463
015279 0.560
015280 0.317
015281 0.830
015282 0.803
015283 0.682
015284 0.268
015285 0.939
015286 0.890 0.905
015287 0.966 0.580
015288 0.915 0.637
015289 0.573 0.455 0.043
** 2023届高三05班
017223 1.000
017224 0.921
017225 0.947
017226 0.974
017227 1.000
017228 0.526
017229 0.947
017230 0.895
017231 0.737
017232 0.316
017233 0.737
017234 0.053
017235 1.000
017236 0.947
017237 0.526
017238 0.237
017239 1.000 0.984
017240 0.939 0.957
017241 1.000 0.684 0.811
017242 0.961 0.386 0.062
017243 0.875 0.434 0.007
[END]
[BEGIN]
## 20230418
** 2025届高一06班
015269 0.927
015270 1.000
015271 0.950
015272 0.903
015273 0.803
015274 0.780
015275 0.487
015276 0.660
015277 0.440
015278 0.513
015279 0.293
015280 0.243
015281 0.757
015282 0.803
015283 0.537
015284 0.245
015285 0.890
015286 0.892 0.930
015287 0.966 0.492
015288 0.890 0.544
015289 0.625 0.427 0.013
** 2023届高三06班
017223 0.974
017224 0.949
017225 0.949
017226 0.974
017227 0.949
017228 0.436
017229 0.974
017230 0.846
017231 0.667
017232 0.231
017233 0.667
017234 0.077
017235 1.000
017236 1.000
017237 0.641
017238 0.410
017239 1.000 0.949
017240 0.940 0.888
017241 1.000 0.756 0.791
017242 0.962 0.427 0.122
017243 0.865 0.355 0.035
[END]
[BEGIN]
## 20230418
** 2025届高一07班
015269 0.930
015270 0.977
015271 0.953
015272 1.000
015273 0.737
015274 0.787
015275 0.667
015276 0.737
015277 0.310
015278 0.500
015279 0.380
015280 0.190
015281 0.930
015282 0.833
015283 0.547
015284 0.215
015285 0.955
015286 0.965 0.912
015287 0.950 0.488
015288 0.875 0.514
015289 0.672 0.517 0.005
** 2023届高三07班
017223 0.970
017224 0.970
017225 0.970
017226 1.000
017227 0.939
017228 0.545
017229 1.000
017230 0.636
017231 0.394
017232 0.333
017233 0.576
017234 0.000
017235 1.000
017236 1.000
017237 0.424
017238 0.273
017239 0.985 0.924
017240 0.965 0.928
017241 0.939 0.712 0.742
017242 1.000 0.364 0.000
017243 0.939 0.359 0.000
[END]
[BEGIN]
## 20230418
** 2025届高一08班
015269 0.973
015270 1.000
015271 0.973
015272 0.947
015273 0.817
015274 0.710
015275 0.607
015276 0.710
015277 0.317
015278 0.553
015279 0.290
015280 0.183
015281 0.683
015282 0.737
015283 0.580
015284 0.105
015285 0.975
015286 0.948 0.935
015287 0.942 0.426
015288 0.835 0.474
015289 0.535 0.398 0.007
** 2023届高三08班
017223 1.000
017224 1.000
017225 0.846
017226 1.000
017227 0.923
017228 0.577
017229 0.962
017230 0.615
017231 0.692
017232 0.231
017233 0.731
017234 0.038
017235 1.000
017236 1.000
017237 0.577
017238 0.346
017239 1.000 1.000
017240 0.981 0.962
017241 1.000 0.712 0.660
017242 1.000 0.397 0.087
017243 0.904 0.423 0.029
[END]
[BEGIN]
## 20230418
** 2025届高一09班
015269 0.953
015270 0.977
015271 0.953
015272 0.953
015273 0.860
015274 0.743
015275 0.510
015276 0.813
015277 0.490
015278 0.650
015279 0.443
015280 0.257
015281 0.767
015282 0.767
015283 0.650
015284 0.325
015285 0.975
015286 0.915 0.970
015287 0.958 0.612
015288 0.833 0.517
015289 0.662 0.532 0.005
** 2023届高三09班
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017241 1.000 0.658 0.783
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[END]
[BEGIN]
## 20230418
** 2025届高一10班
015269 0.950
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015286 0.948 0.950
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015288 0.890 0.650
015289 0.750 0.695 0.040
** 2023届高三10班
017223 0.973
017224 1.000
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017227 0.973
017228 0.595
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017243 0.858 0.306 0.024
[END]
[BEGIN]
## 20230418
** 2025届高一11班
015269 1.000
015270 1.000
015271 1.000
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015275 0.767
015276 0.907
015277 0.533
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015279 0.533
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015283 0.767
015284 0.185
015285 0.985
015286 0.995 0.927
015287 0.990 0.724
015288 0.953 0.685
015289 0.780 0.800 0.122
** 2023届高三11班
017223 1.000
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017243 0.863 0.333 0.006
[END]
[BEGIN]
## 20230418
** 2025届高一12班
015269 0.977
015270 1.000
015271 1.000
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015285 0.971
015286 0.917 0.983
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015288 0.882 0.632
015289 0.770 0.710 0.037
** 2023届高三12班
017223 0.958
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017236 1.000
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017241 1.000 0.698 0.812
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017243 0.854 0.319 0.005
[END]

View File

@ -1,7 +1,7 @@
texfile = r"D:\mathdeptv2\工具\临时文件\高一区统考_学生用_20230421.tex"
excelfile = r"C:\Users\weiye\Documents\wwy sync\临时工作区\高一区统考.xlsx"
texfile = r"C:\Users\weiye\Documents\wwy sync\23届\下学期测验卷\高三下学期月考02.tex"
excelfile = r"C:\Users\weiye\Documents\wwy sync\23届\统计数据\大型考试\年级_20230516月考.xlsx"
date = "20230418"
grade = "2025届高一"
grade = "2023届高三"
sheetname = "难度统计"
max_classnum = 12

View File

@ -441830,7 +441830,20 @@
"ans": "$\\{1\\}$",
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"edit": [
"20230507\t余利成"
@ -441850,7 +441863,20 @@
"ans": "$1$",
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"origin": "2023届高三下学期月考2试题2",
"edit": [
"20230507\t余利成"
@ -441870,7 +441896,20 @@
"ans": "$\\dfrac{\\pi}{3}$",
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"20230507\t余利成"
@ -441890,7 +441929,20 @@
"ans": "$70$",
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"20230507\t余利成"
@ -441910,7 +441962,20 @@
"ans": "$\\dfrac{1}{8}$",
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"20230507\t余利成"
@ -441930,7 +441995,20 @@
"ans": "$y=-\\dfrac{1}{32}$",
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"20230507\t余利成"
@ -441950,7 +442028,20 @@
"ans": "$\\dfrac{2}{3}$",
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"20230507\t余利成"
@ -441970,7 +442061,20 @@
"ans": "$36\\pi$",
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"20230507\t余利成"
@ -441990,7 +442094,20 @@
"ans": "$0.1$",
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"20230507\t余利成"
@ -442010,7 +442127,20 @@
"ans": "$\\dfrac{17}{32}$",
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"20230507\t余利成"
@ -442030,7 +442160,20 @@
"ans": "$[2,2^{2023}]$",
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"20230507\t余利成"
@ -442050,7 +442193,20 @@
"ans": "$[\\dfrac{1}{2},+\\infty)$",
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@ -442070,7 +442226,20 @@
"ans": "D",
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@ -442090,7 +442259,20 @@
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@ -442110,7 +442292,20 @@
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"20230507\t余利成"
@ -442150,7 +442358,20 @@
"ans": "(1) $h=1$; (2) $\\arcsin\\dfrac{\\sqrt{10}}{5}$",
"solution": "(1) 由底面$ABC$为等腰直角三角形且 $AB \\perp AC$知$AB\\perp$平面$ACC_1A_1$, \\\\\n从而$BM$在平面$ACC_1A_1$上的投影为$AM$,\n故由$BM \\perp A_1C$ 知 $AM\\perp A_1C $, \\\\\n结合$AC=2$, $AA_1=4$ 得 $MC=1$, 即$h=1$.\\\\\n(2) 如图建系:以$A$为原点,分别以$\\overrightarrow{AB}$、$\\overrightarrow{AC}$、$\\overrightarrow{AA_1}$方向为$x$轴、 $y$轴、$z$ 轴正方向建立平面直角坐标系.\\\\\n$A(0,0,0),B(2,0,0),C(0,2,0),A_1(0,0,4),M(0,2,2)$,\n$\\overrightarrow{BA_1}=(-2,0,4),\\overrightarrow{AB}=(2,0,0),\\overrightarrow{AM}=(0,2,2),$\\\\\n设平面$ABM$的一个法向量为$\\overrightarrow{n}=(x,y,z)$, 则$\\begin{cases}\n2x=0,\\\\\n2y+2z=0.\n\\end{cases}$ 取$\\overrightarrow{n}=(0,1,-1),$设直线$BA_1$与平面$ABM$所成的角为$\\theta$, 则$\\sin\\theta=|\\cos \\langle\\overrightarrow{BA_1},\\overrightarrow{n}\\rangle|=\\dfrac{|\\overrightarrow{BA_1}\\cdot\\overrightarrow{n}|}{|\\overrightarrow{BA_1}|\\cdot|\\overrightarrow{n}|}=\\dfrac{\\sqrt{10}}{5}$, 故直线$BA_1$与平面$ABM$所成的角为$\\arcsin\\dfrac{\\sqrt{10}}{5}$.",
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"origin": "2023届高三下学期月考2试题17",
"edit": [
"20230507\t余利成"
@ -442170,7 +442391,20 @@
"ans": "(1) $a-c=\\pm 1$; (2) $C=\\dfrac{\\pi}{3}$",
"solution": "(1) 由 $S=\\dfrac{1}{2}ac\\sin B=\\dfrac{\\sqrt{3}}{4}ac=\\sqrt{3}$知$ac=4$\\\\\n由$a^2+c^2-b^2=2ac\\cos B$知$a^2+c^2=9$.\\\\\n结合两式得$(a-c)^2=1$, 故$a-c=\\pm 1$\\\\\n(2) 由$2\\cos C (ac\\cos B+cb\\cos A)=c^2$知$2a\\cos B\\cos C+2b \\cos A\\cos C=c$,\\\\\n又由正弦定理知 $2\\cos C(\\sin A\\cos B+\\sin B\\cos A)=\\sin C$\\\\\n$2\\cos C \\sin (A+B)=2\\cos C \\sin C=\\sin C$,其中$C\\in (0,\\pi), \\sin C>0$,\\\\\n故$\\cos C=\\dfrac{1}{2}$, $C\\in(0,\\pi)$, $C=\\dfrac{\\pi}{3}$.",
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"origin": "2023届高三下学期月考2试题18",
"edit": [
"20230507\t余利成"
@ -442190,7 +442424,20 @@
"ans": "(1) $p=60$, $q=40$, $x=100$, $y=100$; (2) $\\chi^2=8$, 有$95 \\%$的把握认为注射此种疫苗有效; (3) 分布为$\\begin{pmatrix}0&1&2&3&4\\\\\\dfrac{1}{210}&\\dfrac{4}{35}&\\dfrac{3}{7}&\\dfrac{8}{21}&\\dfrac{1}{14}\\end{pmatrix}$, $E[X]=\\dfrac{12}{5}$",
"solution": "(1) $\\dfrac{p}{p+40}=\\dfrac{3}{5}$得$p=60$, $q=40$, $x=100$, $y=100$.\\\\\n(2) 原假设$H_0:$ 是否注射此种疫苗与是否感染病毒无关.\\\\\n$\\chi^2=\\dfrac{200\\times (40\\times 40-60\\times 60)^2}{100\\times 100\\times 100\\times 100}=8>3.841$\\\\\n故拒绝原假设即有$95 \\%$的把握认为注射此种疫苗有效.\\\\\n(3) 抽取$6$只未注射疫苗、$4$只注射疫苗的小白鼠.\\\\\n$P(X=0)=\\dfrac{C_6^0C_4^4}{C_{10}^4}=\\dfrac{1}{210}$;\\\\\n$P(X=1)=\\dfrac{C_6^1C_4^3}{C_{10}^4}=\\dfrac{4}{35}$;\\\\\n$P(X=2)=\\dfrac{C_6^2C_4^2}{C_{10}^4}=\\dfrac{3}{7}$;\\\\\n$P(X=3)=\\dfrac{C_6^3C_4^1}{C_{10}^4}=\\dfrac{8}{21}$;\\\\\n$P(X=4)=\\dfrac{C_6^4C_4^0}{C_{10}^4}=\\dfrac{1}{14}$.\\\\\n故$X$的分布为$\\begin{pmatrix}\n0&1&2&3&4\\\\\n\\dfrac{1}{210}&\\dfrac{4}{35}&\\dfrac{3}{7}&\\dfrac{8}{21}&\\dfrac{1}{14}\n\\end{pmatrix},$\\\\\n期望$E[X]=0\\times \\dfrac{1}{210}+1\\times \\dfrac{4}{35}+2\\times \\dfrac{3}{7}+3\\times \\dfrac{8}{21}+4\\times \\dfrac{1}{14}=\\dfrac{12}{5}$.",
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"origin": "2023届高三下学期月考2试题19",
"edit": [
"20230507\t余利成"
@ -442210,7 +442457,20 @@
"ans": "(1) $\\dfrac 12$; (2) 证明略; (3) $\\dfrac 92$",
"solution": "(1) 椭圆的离心率$e=\\dfrac{1}{2}$;\\\\\n(2) 证明: 当$x_0=2$时,$y_0=0,$ 过点$P$的椭圆$C$的切线方程为 $x=2$,符合$\\dfrac{x_0 x}{4}+\\dfrac{y_0 y}{3}=1$\\\\\n同理当$x_0=-2$时,也符合;\\\\\n当$x_0\\neq\\pm 2$时,设过点$P$的椭圆$C$的切线方程为$y-y_0=k(x-x_0)$($k$存在),\\\\\n联立$\\begin{cases}\ny-y_0=k(x-x_0),\\\\\n \\dfrac{x^2}{4}+\\dfrac{y^2}{3}=1\n\\end{cases}$得$(3+4k^2)x^2+8k(y-kx_0)x+4(y_0-kx_0)^2-12=0$,\\\\\n$\\Delta=0$得$(x_0^2-4)k^2-2x_0y_0k+y_0^2-3=0$,解得$k=\\dfrac{x_0y_0}{x_0^2-4}=\\dfrac{x_0y_0}{4(1-\\dfrac{y_0^2}{3})-4}=-\\dfrac{3x_0}{4y_0}.$\\\\\n故$y-y_0=-\\dfrac{3x_0}{4y_0}(x-x_0)$,即$\\dfrac{x_0 x}{4}+\\dfrac{y_0 y}{3}=1$.\\\\\n综上过点$P$的椭圆$C$的切线方程为$\\dfrac{x_0 x}{4}+\\dfrac{y_0 y}{3}=1$.\\\\\n(3) 设$A(x_1,y_1).B(x_2,y_2),x_1\\neq x_2,M(4,t)$.\\\\\n则切线$MA:\\dfrac{x_1x}{4}+\\dfrac{y_1y}{3}=1,$代入$(4,t)$得$x_1+\\dfrac{ty_1}{3}=1$,\\\\\n同理$x_1+\\dfrac{ty_1}{3}=1$\\\\\n故$A(x_1,y_1),B(x_2,y_2)$在直线$x+\\dfrac{ty}{3}=1$上,故直线$AB:x=-\\dfrac{ty}{3}+1$.\\\\\n联立$\\begin{cases}\nx=-\\dfrac{ty}{3}+1,\\\\\n\\dfrac{x^2}{4}+\\dfrac{y^2}{3}=1\n\\end{cases}$\n得\n$(4+\\dfrac{t^2}{3})y^2-2ty-9=0$, $\\Delta=16t^2+144>0$,\\\\\n$|AB|=\\sqrt{1+\\dfrac{t^2}{9}}\\cdot |y_1-y_2|=\\sqrt{1+\\dfrac{t^2}{9}}\\cdot \\dfrac{\\sqrt{16t^2+144}}{4+\\dfrac{t^2}{3}}$,\\\\\n$M$到直线$AB$的距离$d=\\dfrac{|4+\\dfrac{t^2}{3}-1|}{\\sqrt{1+\\dfrac{t^2}{9}}}=\\dfrac{3+\\dfrac{t^2}{3}}{\\sqrt{1+\\dfrac{t^2}{9}}}$,\\\\\n$\\triangle MAB$的面积$S=\\dfrac{1}{2}|AB|\\cdot d=\\dfrac{1}{2}\\cdot \\sqrt{1+\\dfrac{t^2}{9}}\\cdot \\dfrac{\\sqrt{16t^2+144}}{4+\\dfrac{t^2}{3}}\\cdot \\dfrac{3+\\dfrac{t^2}{3}}{\\sqrt{1+\\dfrac{t^2}{9}}}=\\dfrac{2(t^2+9)\\sqrt{t^2+9}}{t^2+12}$,\\\\\n令$\\lambda=\\sqrt{t^2+9}\\geq3, S=f(\\lambda)=\\dfrac{2\\lambda^3}{\\lambda^2+3},$\n则$f^{'} (\\lambda)=\\dfrac{2\\lambda^4+18\\lambda^2}{(\\lambda^2+3)^2}>0$,故$f(\\lambda)$在$[3,+\\infty)$严格增,$f(\\lambda)_{\\min}=f(3)=\\dfrac{9}{2}$,故$\\triangle MAB$的面积的最小值为$\\dfrac{9}{2},$ 此时$M$的坐标为$(4,0)$.",
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"origin": "2023届高三下学期月考2试题20",
"edit": [
"20230507\t余利成"
@ -442230,7 +442490,20 @@
"ans": "(1) 证明略; (2) $3$; (3) 不存在, 证明略",
"solution": "(1) $x_1=\\dfrac{1}{2},x_{n+1}=g(x_n)=\\dfrac{x_n}{x_{n+1}},$故$x_n>0,\\dfrac{1}{x_{n+1}}=\\dfrac{x_n+1}{x_n}=\\dfrac{1}{x_n}+1$,即$\\dfrac{1}{x_{n+1}}-\\dfrac{1}{x_{n}}=1$,\\\\因此数列$\\{\\dfrac{1}{x_n}\\}$是以$2$为首项,$1$为公差的等差数列.\\\\\n(2) 对任意$x>0$ 均有$f(x)-mg(x)=\\ln (x+1)-\\dfrac{mx}{x+1}+1>0,$\\\\\n令$h(x)=\\ln (x+1)-\\dfrac{mx}{x+1}+1,x>0,$则$h^{'}(x)=\\dfrac{x+1-m}{(x+1)^2}$.\\\\\n当$m\\geq4$时,$h(1)=\\ln 2-\\dfrac{m}{2}+1<2-\\dfrac{m}{2}<0,$这与$h(x)>0$对$x>0$恒成立矛盾;\\\\\n当$m=3$时,$h(x)=\\ln (x+1)-\\dfrac{3x}{x+1}+1,h^{'}(x)\\dfrac{x-2}{(x+1)^2}.h(x)$在$(0,2]$严格减,在$[2,+\\infty)$严格增,故$h(x)_{\\min}=h(2)=\\ln 3-2+1=\\ln 3-1>0$,符合题意.\\\\\n综上整数$m$的最大值为$3$.\\\\\n(3) 对任意正整数$t$,取$n=100t,$则 \\\\$\\displaystyle f(n-t)=f(99t)=\\ln (1+99t)=\\ln \\dfrac{1+99t}{99t}+\\ln \\dfrac{99t}{99t-1}+\\cdots +\\ln \\dfrac{2}{1}=\\sum_{k=1}^{99t}\\ln (1+\\dfrac{1}{k}).$\\\\\n$\\displaystyle n-\\sum_{k=1}^{100t}g(k)=\\sum_{k=1}^{100t}(1- g(k))=\\sum_{k=1}^{100t} \\dfrac{1}{1+k}=\\sum_{k=1}^{99t} \\dfrac{1}{1+k}+\\sum_{k=99t+1}^{100t} \\dfrac{1}{1+k}.$\\\\\n$\\displaystyle f(n-t)-[ n-\\sum_{k=1}^{100t}g(k)]=\\sum_{k=1}^{99t} (\\ln (1+\\dfrac{1}{k})-\\dfrac{1}{1+k})-\\sum_{k=99t+1}^{100t} \\dfrac{1}{1+k}.$\\\\\n令$H(x)=\\ln (x+1)-\\dfrac{x}{x+1},x>0$,则$H^{'}(x)=\\dfrac{x}{(x+1)^2}>0$恒成立,故$H(x)$在$(0,+\\infty)$严格增,$H(x)>H(0)=0$,故$\\ln (1+x)>\\dfrac{x}{x+1}$对$x>0$恒成立.\\\\\n因此$\\ln (1+\\dfrac{1}{k})>\\dfrac{\\dfrac{1}{k}}{1+\\dfrac{1}{k}}=\\dfrac{1}{1+k}$,\\\\\n$\\displaystyle f(n-t)-[ n-\\sum_{k=1}^{100t}g(k)]=\\sum_{k=1}^{99t} (\\ln (1+\\dfrac{1}{k})-\\dfrac{1}{1+k})-\\sum_{k=99t+1}^{100t} \\dfrac{1}{1+k}$\\\\\n$\\displaystyle>\\sum_{k=2}^{99t} (\\ln (1+\\dfrac{1}{k})-\\dfrac{1}{1+k})+(\\ln 2-\\dfrac{1}{2})- \\dfrac{t}{1+99t+1}>\\ln 2-\\dfrac{1}{2}-\\dfrac{1}{99+\\dfrac{2}{t}}>0.1-\\dfrac{1}{99}>0.$\\\\\n因此不存在正整数$t$使得对任意$n \\in \\mathbf{N}$, $n \\geq t$, 都有$\\displaystyle f(n-t)<n-\\sum_{k=1}^n g(k)$成立.",
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