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解题方法
1 . 已知
,若
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c74fb2f4ea29ff915c52a182e53f4b2.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd357b075b18849337097a275e866bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2333f966f6ec29f0661f93d99b055cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9d0d79fd0efdb59c9ca65bfae4a0861.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c74fb2f4ea29ff915c52a182e53f4b2.png)
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2 . 已知集合
,对于它的非空子集
,计算
中的所有元素的和,则对
的所有非空子集,这些和的总和是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15745ac8c69c76311d9431c2b248adbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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3 .
中,内角
的对边分别为
,若
,
,
的面积
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47e66258d3c21dd9bf44dab2c960afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2dd89c37b60b4596ac30e339aa0000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
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2023-11-10更新
|
387次组卷
|
7卷引用:江苏省部分四星级高中2023-2024学年高三上学期期初调研数学试题
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解题方法
4 . 有下列结论:①
;②
;③
;④若角A为锐角,则
.其中正确的是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8d71d2faf1827ac185c7ac21404aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bccfc225bfab60282529deb25e769fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/919a4d2d4cd9dc48a7f043dc0d101e39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4ff0d3e24d9fee26178607f8c3afa6.png)
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5 . 甲、乙、丙、丁四位同学五次数学测验成绩统计如下表所示,如果从这四位同学中选出一位同学参加数学竞赛,那么应选______ 去.
甲 | 乙 | 丙 | 丁 | |
平均分 | 85 | 90 | 90 | 85 |
方差 | 50 | 42 | 50 | 42 |
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6 . 已知单位向量
,
满足
,则
与
的夹角为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d2e204d110ff632f25c6fb50d3fee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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2024-03-25更新
|
597次组卷
|
5卷引用:四川省达州市渠县中学2022-2023学年高二下学期开学考试理科数学试题
7 . 复数
,则
=___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e9ab0078edd9a942fbb6f2b7cedf92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de971553ea8a66d7849b138a4a0625c5.png)
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2023-10-26更新
|
156次组卷
|
2卷引用:四川省眉山第一中学2023-2024学年高三上学期9月入学考试理科数学试题
8 . 构建几何图形解决代数问题是数形结合思想的重要应用.在计算
时,如图,在
中,
,
,延长
,使
,连接
,得
,所以
.类比这种方法,计算
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd90c9ff8a48465550e329fbcbd46c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4dd6e7c88601b4c50b06f1238fdd95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7911b182be6e510a6d7ad195a1156a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d618d52902d46fd01c0d195006b2e641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87b338c6a892a41bae1ccfb227ec85d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/9b340901-b41e-4eb8-ab77-c309db294593.png?resizew=225)
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9 . 若一个圆锥的底面圆半径为2,其侧面展开图的圆心角为
,则圆锥的母线长是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
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10 . 已知,则
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2024-03-20更新
|
2252次组卷
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3卷引用:黑龙江省哈尔滨市双城区兆麟中学2022-2023学年高二下学期开学考试数学试题