解题方法
1 . 已知
,
,
,
是平面内四个互不相同的点,
为不共线向量,
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3414f1e278f706e6c0026d76e9c890ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa5eb86b41cdeba3fc37bd5a0aab0c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c05b5cbe9219fcac9e3c16cf8c5bb9.png)
A.![]() ![]() ![]() | B.![]() ![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
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2 . 若数列
相邻两项的和依次构成等差数列,则称
是“邻和等差数列”.例如,数列
,
为“邻和等差数列”.已知数列
是“邻和等差数列”,
是其前
项和,且
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27140692bd6cad765e4f98c8e074b8dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c19d78707974fd26e6f36ee4239452b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec487bb058d7a21725af4eea93b71d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46293a2dd0d822a27f0b57e33c7e6f34.png)
A.39700 | B.39800 | C.39900 | D.40000 |
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解题方法
3 . 已知函数
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4049f0b2acecad7f5f598d46b5904a64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29a29dec2bd598b2f323f6e4868a370.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 设等比数列的前7项和、前14项和分别为2,8,则该等比数列的前28项和为( )
A.64 | B.72 | C.80 | D.92 |
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5 . 我国古代的数学著作《九章算术》中的一个问题,现有一个“圆材埋壁”模型,其截面如图所示.若圆柱材料的截面圆的半径长为3,圆心为O,墙壁截面ABCD为矩形,且劣弧
的长等于半径OA长的2倍,则圆材埋在墙壁内部的阴影部分截面面积是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
A.![]() | B.![]() | C.![]() | D.9 |
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解题方法
6 . 若两个单位向量
,
的夹角为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb01332c33521cc389cf4a1ceed6f1a.png)
A.2 | B.![]() | C.1 | D.![]() |
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解题方法
7 . 化简
得( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13e01d46f19502dcb7293ad7b02757b7.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
8 . 已知点
落在角
的终边上,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781b089662bf214668aae489bda55497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2b8dae45cd30a752aedb1ca66c30a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 正方体
中,
为
的中点,则直线
与直线
所成角为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
10 . 若圆锥的轴截面是斜边为4的等腰直角三角形,则该圆锥的体积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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