diff --git a/题库0.3/Problems.json b/题库0.3/Problems.json index 8f62f06c..de1fb71b 100644 --- a/题库0.3/Problems.json +++ b/题库0.3/Problems.json @@ -605026,6 +605026,246 @@ "space": "4em", "unrelated": [] }, + "022859": { + "id": "022859", + "content": "若集合 $A=\\{x | 0=latex]\n\\draw (0,0,0) node [below] {$D$} coordinate (D);\n\\draw (2,0,0) node [right] {$C$} coordinate (C);\n\\draw (2,0,2) node [below] {$B$} coordinate (B);\n\\draw (0,0,2) node [below] {$A$} coordinate (A);\n\\draw (0,2,0) node [above] {$S$} coordinate (S);\n\\draw ($(D)!0.6!(S)$) node [left] {$E$} coordinate (E);\n\\draw (A)--(B)--(C)--(S)--cycle(B)--(S);\n\\draw [dashed] (A)--(C)(E)--(B)(A)--(D)--(C)(S)--(D);\n\\end{tikzpicture}\n\\end{center}\n(1) 求证: $AC \\perp BE$;\\\\\n(2) 试确定点 $E$ 的位置, 使 $BE$ 与平面 $ABCD$ 所成角的大小为 $30^{\\circ}$.", + "objs": [], + "tags": [], + "genre": "解答题", + "ans": "", + "solution": "", + "duration": -1, + "usages": [], + "origin": "2024届高三上学期124分守护卷题目", + "edit": [ + "20231124\t毛培菁" + ], + "same": [], + "related": [], + "remark": "", + "space": "4em", + "unrelated": [] + }, + "022868": { + "id": "022868", + "content": "某贫困村共有农户 $100$ 户, 均从事水果种植, 平均每户年收入为 $1.8$ 万元. 在当地政府大力扶持和引导下, 村委会决定, 2020 年初抽出 $5 x$ 户 ($x$ 是不大于 $9$ 的正整数) 从事水果销售工作. 经测算, 剩下从事水果种植的农户平均每户年收入比上一年提高了 $4 x \\%$,\n而从事水果销售的农户平均每户年收入为 $(3-\\dfrac{1}{5}x)$ 万元.\\\\\n(1) 为了使从事水果种植的农户三年后平均每户年收入不低于 2.4 万元, 那么 2020 年初至少应抽出多少农户从事水果销售工作?\\\\\n(2) 若一年后, 该村平均每户的年收入为 $f(x)$ (万元), 问 $f(x)$ 的最大值是否可以达到 2.1 万元?", + "objs": [], + "tags": [], + "genre": "解答题", + "ans": "", + "solution": "", + "duration": -1, + "usages": [], + "origin": "2024届高三上学期124分守护卷题目", + "edit": [ + "20231124\t毛培菁" + ], + "same": [], + "related": [], + "remark": "", + "space": "4em", + "unrelated": [] + }, + "022869": { + "id": "022869", + "content": "已知曲线 $C: x^2-y^2=1$, 过点 $T(t, 0)$ 作直线 $l$ 和曲线 $C$ 交于 $A, B$ 两点.\\\\\n(1) 求曲线 $C$ 的焦点到它渐近线的距离;\\\\\n(2) 若 $t=0$, 点 $A$ 在第一象限, $AH \\perp x$ 轴, 垂足为 $H$, 连结 $BH$. 求直线 $BH$ 倾斜角的取值范围.", + "objs": [], + "tags": [], + "genre": "解答题", + "ans": "", + "solution": "", + "duration": -1, + "usages": [], + "origin": "2024届高三上学期124分守护卷题目", + "edit": [ + "20231124\t毛培菁" + ], + "same": [], + "related": [], + "remark": "", + "space": "4em", + "unrelated": [] + }, + "022870": { + "id": "022870", + "content": "定义 $f(a_1, a_2, \\cdots, a_n)=|a_1-a_2|+|a_2-a_3|+\\cdots+|a_{n-1}-a_n|$($n \\in \\mathbf{N}$, $n \\geq 3$) 为有限实数列 $\\{a_n\\}$ 的``波动强度''.\\\\\n(1) 求数列 $1,4,2,3$ 的``波动强度'';\\\\\n(2) 若数列 $a, b, c, d$ 满足 $(a-b)(b-c)>0$, 判断 $f(a, b, c, d) \\leq f(a, c, b, d)$ 是否正确,如果正确请证明, 如果错误请举出反例.", + "objs": [], + "tags": [], + "genre": "解答题", + "ans": "", + "solution": "", + "duration": -1, + "usages": [], + "origin": "2024届高三上学期124分守护卷题目", + "edit": [ + "20231124\t毛培菁" + ], + "same": [], + "related": [], + "remark": "", + "space": "4em", + "unrelated": [] + }, "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