名校
解题方法
1 . 在正方体
中.
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220499513712640/2221089699241984/STEM/d64269675fca4533a7deea17e368ce25.png?resizew=154)
(1)若
为棱
上的点,试确定点
的位置,使平面
;
(2)若
为
上的一动点,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4cf99a0d5833beacc3a0ee39d39458.png)
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220499513712640/2221089699241984/STEM/d64269675fca4533a7deea17e368ce25.png?resizew=154)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4ee628f1f5b2c224e4e9a759ffc305.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba8f7af0e091e082100c3cd7f8c487f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349740b9aa8c242258eb07cb7224c3f6.png)
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2卷引用:2015-2016学年四川省雅安中学高二10月月考数学试卷
2 . 在空间,下列命题错误的是
A.一条直线与两个平行平面中的一个相交,则必与另一个相交 |
B.一个平面与两个平行平面相交,交线平行 |
C.平行于同一平面的两个平面平行 |
D.平行于同一直线的两个平面平行 |
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2016-12-03更新
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6卷引用:2014-2015学年河北省定兴第三中学高一6月月考理科数学试卷
12-13高三·广东广州·开学考试
名校
3 . 对于平面
、
、
和直线
、
、
、
,下列命题中真命题是
![](https://img.xkw.com/dksih/QBM/2013/8/23/1571326849302528/1571326854561792/STEM/870013c7d8ef410eb32b1370739a2205.png?resizew=15)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
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2016-12-02更新
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8卷引用:2014届广东省汕头四中高三第二次月考理科数学试卷
(已下线)2014届广东省汕头四中高三第二次月考理科数学试卷2015届河北省唐山市一中高三12月调研考试理科数学试卷(已下线)2014届广东省广州市海珠区高三入学摸底考试理科数学试卷(已下线)2014届广东省广州市海珠区高三入学摸底考试文科数学试卷(已下线)2015届福建省惠安一中等三校高三上学期期中联考文科数学试卷广东第二师范学院番禺附属中学2018-2019学年高一下学期期末测试数学试题安徽省铜陵市第一中学2018-2019学年高二上学期期中数学试题湖北省襄阳五中、夷陵中学、钟祥一中三校2020届高三下学期6月高考适应性考试理科数学试题
12-13高一上·北京·期末
解题方法
4 . 在四棱锥
中,底面
是直角梯形,
,
,
,平面
平面
.
(1)求证:
平面
;
(2)求平面
和平面
所成二面角(小于
)的大小;
(3)在棱
上是否存在点
使得
平面
?若存在,求
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0073c8e806d0399a6983e163f0fd176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a3fd5284e160896f07ce367645fd04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1b489c25405ce48699d4f0a62820bed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ba22238cdff318a4bd9d4d746b3229.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5865d488a9cf1181016fd2e866177cdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b505e0df1131e3a93fc81d13f6e224e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/fa4fd412-897c-4621-b148-dc248d6cc7a6.png?resizew=135)
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5卷引用:2013届天津市天津一中高三第三次月考理科数学试卷
(已下线)2013届天津市天津一中高三第三次月考理科数学试卷(已下线)2011-2012学年北京市育园中学高一第一学期期末考试数学(已下线)2011-2012学年北京市海淀区高三上学期期末考试理科数学北京西城回民中学2018届高三上期中数学(理)试题北京市东城区2018届高三上学期期中考试数学试题
11-12高一·全国·课后作业
名校
5 . 已知平面α∥平面β,P是α、β外一点,过P点的两条直线PAC、PBD分别交α于A、B,交β于C、D,且PA=6,AC=9,AB=8,则CD的长为___________.
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2016-12-02更新
|
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5卷引用:山西省临猗县临晋中学2020-2021学年高二上学期9月月考数学(理)试题
12-13高三上·浙江宁波·阶段练习
6 . 如图所示,在等腰梯形
中,
,
,
为
中点.将
沿
折起至
,使得平面
平面
,
分别为
的中点.
(Ⅰ) 求证:
面
;
(Ⅱ) 求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/null/STEM/4cf4bee26ceb4842bf44e25cd78e41b7.png?resizew=348)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/408be444c1bf48639dcdc5a81cd68940.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/e5266c522f584b5e9ccec5c338da51be.png?resizew=152)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/7e99d7969f804740a6f25b8646b5725a.png?resizew=131)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/5b7200e383954b0f94209053c36214a7.png?resizew=15)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/e61c19b2ca4440498e2e2994c17b4c91.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/5eca32991b034c40a2293a65fc33ee71.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/dc1861e7817d49218ad78aa970a9a939.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/229f79415f7d43b5b3903dd5cb7dc8d0.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/8bfb2e9c30374127bfe61832730ca072.png?resizew=52)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/28c1632a047c4a689b07f0b60caaa395.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/f8204085d91c4774b927cec0ea493ecb.png?resizew=40)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/430dddb51c144110a08b14effb9a8098.png?resizew=53)
(Ⅰ) 求证:
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/f6c1b2ea56574ce59b418dcab89a10d3.png?resizew=42)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/893a3496fe4d470fa92bb5b633654b05.png?resizew=37)
(Ⅱ) 求二面角
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/STEM/a84af7f93ab6465ba39cc413074c1677.png?resizew=81)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/null/STEM/4cf4bee26ceb4842bf44e25cd78e41b7.png?resizew=348)
![](https://img.xkw.com/dksih/QBM/2012/2/11/1570730553032704/1570730558537728/ANSWER/4b18e9ec776048099028b263124f9066.png?resizew=171)
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12-13高二上·四川·阶段练习
解题方法
7 . (1)证明直线和平面垂直的判定定理,即已知:如图1,
且
,
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
(2)请用直线和平面垂直的判定定理证明:如果一条直线垂直于两个平行平面中的一个,那么它也垂直于另一个平面,即
已知:如图2,
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cc1ed828a703622287cd28180d7986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/260575a314a2dc229c718cd52a0e5c67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60750b5eab6344496e925eb603cab46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cfc54f2a9d7f4fa37f6d24fa9f79a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
(2)请用直线和平面垂直的判定定理证明:如果一条直线垂直于两个平行平面中的一个,那么它也垂直于另一个平面,即
已知:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2acbf279dbafff1b748eef29e2661624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cc1ed828a703622287cd28180d7986.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570679589920768/1570679595548672/STEM/37be3cc4-b809-48e4-9cb1-e200b42c90da.png?resizew=408)
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12-13高三上·浙江台州·阶段练习
8 . 右图为一简单组合体,其底面ABCD为正方形,
,
且PD=AD=2EC=2,
(1)求证:
平面
;(2)求PA与平面PBD所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d66e834d5a04a5ffc5bbeff424f537.png)
![](https://img.xkw.com/dksih/QBM/2012/1/2/1570671644237824/1570671649726464/STEM/b9da660cdb4a4a8eb20715c3c8290f3a.png?resizew=62)
且PD=AD=2EC=2,
(1)求证:
![](https://img.xkw.com/dksih/QBM/2012/1/2/1570671644237824/1570671649726464/STEM/e18f26f53d8f496eb080615724b0daee.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2012/1/2/1570671644237824/1570671649726464/STEM/89aa59639c1f4ffb88e59bfd81f215c1.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2012/1/2/1570671644237824/1570671649726464/STEM/19ba9f251e6f4bd9b1f4c94a3de1e95b.png?resizew=227)
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9 . 如图,在六面体
中,平面
平面
,
平面
,
平面
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/2011/12/22/1570628813758464/1570628819214336/STEM/f9a6d72fbf6543bfb89a677329cb85ee.png?resizew=171)
(1)求证:平面
平面
;
(2)求证:
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20e38a1b5cfffd43a3405481a1d67cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617edf7f259f5955db7cad814af85281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beeedb7ddaac2cd3d37151d058ab7fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f383b759b5207e29698e93ed86216a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd6ae694a4678178afc4439cc7608f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151b7172db8b4af240ef0439778d792c.png)
![](https://img.xkw.com/dksih/QBM/2011/12/22/1570628813758464/1570628819214336/STEM/f9a6d72fbf6543bfb89a677329cb85ee.png?resizew=171)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51838e395dfc9d9ef597d9e01f46272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3df0d9a6c83b35a863544a01f22ef7.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26712d1a7a5864cd18498f16f7bd96c.png)
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11-12高一上·广东揭阳·阶段练习
10 . 如图,正四棱锥S-ABCD的底面是边长为
正方形,O为底面对角线交点,侧棱长是底面边长的
倍,P为侧棱SD上的点.
.![](https://img.xkw.com/dksih/QBM/2011/12/7/1570560179462144/1570560184819712/STEM/60292b23160c46d296057206d9af6af4.png?resizew=215)
(Ⅰ)求证:AC⊥SD
(Ⅱ)若SD⊥平面PAC,
为
中点,求证:
∥平面PAC;
(Ⅲ)在(Ⅱ)的条件下,侧棱SC上是否存在一点E, 使得BE∥平面PAC.若存在,求SE:EC的值;若不存在,试说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
.
![](https://img.xkw.com/dksih/QBM/2011/12/7/1570560179462144/1570560184819712/STEM/60292b23160c46d296057206d9af6af4.png?resizew=215)
(Ⅰ)求证:AC⊥SD
(Ⅱ)若SD⊥平面PAC,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(Ⅲ)在(Ⅱ)的条件下,侧棱SC上是否存在一点E, 使得BE∥平面PAC.若存在,求SE:EC的值;若不存在,试说明理由.
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