添加两道关联题

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wangweiye7840 2024-03-04 14:22:07 +08:00
parent 5b36db51b8
commit 93091a3735
1 changed files with 56 additions and 2 deletions

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@ -46542,7 +46542,9 @@
"20220625\t王伟叶"
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@ -49625,7 +49627,8 @@
],
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@ -680632,6 +680635,57 @@
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"024616": {
"id": "024616",
"content": "在三角形$ABC$中, 记$p=\\dfrac{a+b+c}{2}$, $S$表示三角形的面积. 利用$\\sin^2A+\\cos^2A=1$, 证明:\n$$S=\\sqrt{p(p-a)(p-b)(p-c)}.$$",
"objs": [],
"tags": [
"第三单元"
],
"genre": "4em",
"ans": "",
"solution": "",
"duration": -1,
"usages": [],
"origin": "2016届创新班作业\t2101-正弦定理与余弦定理-20240304修改",
"edit": [
"20220625\t王伟叶",
"20240304\t王伟叶"
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"related": [
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"remark": "",
"space": "4em",
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"024617": {
"id": "024617",
"content": "在$\\triangle ABC$中, 若$a\\cos A=b\\cos B$, 判断该三角形的形状.",
"objs": [],
"tags": [
"第三单元"
],
"genre": "4em",
"ans": "",
"solution": "",
"duration": -1,
"usages": [],
"origin": "2016届创新班作业\t2116-判断三角形的形状-20240304修改",
"edit": [
"20220625\t王伟叶",
"20240304\t王伟叶"
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"030001": {
"id": "030001",
"content": "若$x,y,z$都是实数, 则:(填写``\\textcircled{1} 充分非必要、\\textcircled{2} 必要非充分、\\textcircled{3} 充要、\\textcircled{4} 既非充分又非必要''之一)\\\\\n(1) ``$xy=0$''是``$x=0$''的\\blank{50}条件;\\\\\n(2) ``$x\\cdot y=y\\cdot z$''是``$x=z$''的\\blank{50}条件;\\\\\n(3) ``$\\dfrac xy=\\dfrac yz$''是``$xz=y^2$''的\\blank{50}条件;\\\\\n(4) ``$|x |>| y|$''是``$x>y>0$''的\\blank{50}条件;\\\\\n(5) ``$x^2>4$''是``$x>2$'' 的\\blank{50}条件;\\\\\n(6) ``$x=-3$''是``$x^2+x-6=0$'' 的\\blank{50}条件;\\\\\n(7) ``$|x+y|<2$''是``$|x|<1$且$|y|<1$'' 的\\blank{50}条件;\\\\\n(8) ``$|x|<3$''是``$x^2<9$'' 的\\blank{50}条件;\\\\\n(9) ``$x^2+y^2>0$''是``$x\\ne 0$'' 的\\blank{50}条件;\\\\\n(10) ``$\\dfrac{x^2+x+1}{3x+2}<0$''是``$3x+2<0$'' 的\\blank{50}条件;\\\\\n(11) ``$0<x<3$''是``$|x-1|<2$'' 的\\blank{50}条件.",