如图,在三棱锥
中,平面
平面
,
,
,D,E分别为
,
中点,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986405733171200/2987120984604672/STEM/cf462bab8c594ce3af86fa2de2d7bad5.png?resizew=218)
(1)求
的值;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3735a467f788624fe63946e0da5b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986405733171200/2987120984604672/STEM/cf462bab8c594ce3af86fa2de2d7bad5.png?resizew=218)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2465ee1fec12351943f15055dfd6ec73.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d682fd0344452998187cb6d48de3dd1.png)
2022·湖北武汉·三模 查看更多[2]
更新时间:2022-05-25 18:16:06
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相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】在
中,角
,
,
所对的边分别为
,
,
,已知
,其中
为锐角.
(1)求角
的大小;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417f9d20505d3eda0be3b5dd72516599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd5b9bbd3d22bd2cef53dd4b9691257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8792eaab0b6464e5d07436c64aa751a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,在正四面体中,
是棱
的两个三等分点.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)求出二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035abca18746687d76c4307e160297c7.png)
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【推荐3】已知
.
(1)求
图像的对称中心;
(2)如果
的三边
,
,
满足
,求边
所对的角
的取值范围,用区间表示;
(3)如果
的定义域取(2)中的结果,求此时
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07ff91f0d784ebfb4772666dd6e93d15.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/988b7e964e313579ab8869d67d5be007.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐1】如图,在四棱锥
中,底面ABCD是直角梯形,侧棱
底面ABCD,AB垂直于AD和BC,SA=AB=BC=2,AD=1,M是棱SB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/3831c363-9ad3-44fc-a9d6-de6b04004202.png?resizew=163)
(1)求证:
平面SCD;
(2)求平面SCD与平面SAB所成锐二面角的余弦值;
(3)设点N是线段CD上的动点,MN与平面SAB所成的角为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/3831c363-9ad3-44fc-a9d6-de6b04004202.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f33fa5152ba27f7b8a28890cefca219.png)
(2)求平面SCD与平面SAB所成锐二面角的余弦值;
(3)设点N是线段CD上的动点,MN与平面SAB所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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【推荐2】如图,
平面
,
平面
,
是等边三角形,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879305690079232/1879997989249024/STEM/b6276acbb1f8471c9f372bed5b177d75.png?resizew=183)
(1)求证:
;
(2)若直线
与平面
所成角的正切值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c5ae16a7145a28a91d45ef950a07c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/030b985a2fdc0a7fc22831a700e77d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2018/2/10/1879305690079232/1879997989249024/STEM/b6276acbb1f8471c9f372bed5b177d75.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785546906851d56da452b46052eeb8a0.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7554d7aa1dac63dbfa4a253b17fcd41c.png)
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【推荐3】如图,已知圆锥
,
是底面圆
的直径,且长为4,C是圆O上异于A,B的一点,
.设二面角
与二面角
的大小分别为
与
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/2372cf0e-1701-4f55-995f-64c6544827fb.png?resizew=180)
(1)求
的值;
(2)若
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967f74b8993c61634ceed95edca05ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf29d07c3751c41ab3503065a5a5052e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/2372cf0e-1701-4f55-995f-64c6544827fb.png?resizew=180)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5458c30dbb22889ed27b78ae92f89e78.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf76792693c3d26302f7631276f14398.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a438393ddfc7da1804baf4932442bb35.png)
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解答题-问答题
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解题方法
【推荐1】如图,
与
都是边长为
的正三角形,平面
平面
,
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/6527f062-9a12-4c89-b226-d4d2c67b814d.png?resizew=136)
(1)证明:
平面
.
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e6927e3bc512359dc8b0c11e195d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c72b92177ddfe056e6f90af4f37e64d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ddad21a6de8f54e65123d274c0098c8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/6527f062-9a12-4c89-b226-d4d2c67b814d.png?resizew=136)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f35614aff055b98b76ca262f64e629d.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
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【推荐2】如图,在棱长为3的正方体ABCD−A'B'C'D'中,M为AD的中点.
(1)求证:
平面
;
(2)在体对角线
上是否存在动点Q,使得AQ⊥平面
?若存在,求出DQ的长;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/22/7f71ca4a-14a2-40c0-89b3-83036501a721.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3ea2654fc5e24c4b2571c77397114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8e7a9348fbaf7ec561c60df97f12c1.png)
(2)在体对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da650ee630c36fd5ce9abb4fb826df7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8e7a9348fbaf7ec561c60df97f12c1.png)
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【推荐3】多面体
中,侧面
为正方形,平面
⊥平面
,
,
,
,E为AC的中点,D为棱
上的点,BF⊥A1B1.
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964994999631872/2965963175804928/STEM/ee9e0113-0470-4b5d-89d4-30776a1a733e.png?resizew=176)
(1)证明:AB⊥BC;
(2)求面
与面DFE所成二面角的余弦值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87179db271f28ba764b4db65ab2bd084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a9a9e4164993020f71e01ed2b02c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44538bf929891581b4a34dec5bbbdc1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964994999631872/2965963175804928/STEM/ee9e0113-0470-4b5d-89d4-30776a1a733e.png?resizew=176)
(1)证明:AB⊥BC;
(2)求面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdc94a61b55230862f2e984f34df188.png)
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