1 . 在吸烟与患肺病这两个分类变量的计算中,下列说法正确的是( )
附表:
附表:
![]() | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
![]() | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
A.若![]() ![]() |
B.从独立性检验可知有99%的把握认为吸烟与患肺病有关系时,我们说某人吸烟,那么他有99%的可能性患有肺病 |
C.从统计量中求出有95%的把握认为吸烟与患肺病有关系,是指有5%的可能性使得判断出现错误 |
D.以上三种说法都不正确 |
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名校
解题方法
2 . 如图,正方体
的棱长为1,E,F,G分别为
的中点,则下列说法正确的序号为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/f4445050-0ae4-4d14-852a-354b62e652d7.png?resizew=220)
①直线
与直线
所成角的正切值为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
②直线
与平面
不平行
③点C与点G到平面
的距离相等
④平面
截正方体所得的截面面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4700efcb84c4027ce7a50af0d5212fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473ce0e22c4edc6ef768e0c12f59e483.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/f4445050-0ae4-4d14-852a-354b62e652d7.png?resizew=220)
①直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04777f3f4661fa1c08a1cc0dfb807c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04777f3f4661fa1c08a1cc0dfb807c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
③点C与点G到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
④平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4700efcb84c4027ce7a50af0d5212fc.png)
A.①④ | B.②③ | C.①③ | D.②④ |
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解题方法
3 . 已知
直线,
是平面,给出下列说法,其中正确的说法序号为( )
①若
,则
或
;
②若
,则
;
③若
不垂直于
.则
不可能垂直于
内的无数条直线;
④若
且
,则
且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba63ad02b1d5af2982fac3d91eb15c.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8c1b755be4ad1b0999070ef79d7bd02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59b1a01a6da42ff2a41e5b91ea301ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a53cd751c44ad4d9ebd8e3243e751321.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd3ef9f7bb4d2ab64c4c713d6ace64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c0daa473ebcef025bf44e46bfd963.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dbf7172403709a1dd33a2a183f95f55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f84e2761ae07f726d789e4f3ca4b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0d37b44de48de51555fa95d94e33f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d6ca6fed060a95127579051f7a6b79.png)
A.①② | B.②③ | C.③④ | D.②④ |
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解题方法
4 . 已知正方体
,过对角线
作平面
交棱
于点
,交棱
于点
,则:
①平面
分正方体所得两部分的体积相等;
②四边形
一定是平行四边形;
③平面
与平面
不可能垂直;
④四边形
的面积有最大值.
其中所有正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
②四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef5ea43614d815c3abb27a42dfb101b.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1477ae90a240deba97f8dadf4d7c41aa.png)
④四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef5ea43614d815c3abb27a42dfb101b.png)
其中所有正确结论的序号为( )
A.① | B.② | C.③ | D.④ |
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