如图,已知
是圆
的直径,
,
是⊙
上一点,且
,
,
,![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/58b7a1ffe4e5482b930a0a6d7fdebad2.png)
是
的中点,
是
的中点
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/705cc4db11704f80899766db91d70849.png)
(1)求证:
平面
;
(2)求证:
平面
;
(3)求
与平面
所成角的大小
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/a8f7033605574063b78201a5947be542.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/6b2bdc394fa4468e87ae18b0ab3ed442.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/b0b9a5f28d464a56991521833f797340.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/2ec8a42656e74ba6904cc794fab96f22.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/6b2bdc394fa4468e87ae18b0ab3ed442.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/551ea62241c24d84b6777b7168f7ac97.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/665d7681c35742939fe3013e9b2d236f.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/7996597559b2473089a30e1a4bf892ef.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/58b7a1ffe4e5482b930a0a6d7fdebad2.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/bead1b0426fe433ca35c6bce48988a56.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/c8ff1ddf63dd4cfb9575583ed3107847.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/6f3df7a20a9d4551baf950d185dd2d9a.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/0fa5d8b4f19e4bf3b5b7e4181bbf289e.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/705cc4db11704f80899766db91d70849.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/3ec6a6977a1149dfa06d11584671dfcd.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/ba13ca1cff5b458fbb3f1a32761f74cb.png)
(2)求证:
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/3760772802d543f887e918d30bb3784a.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/389f4766a4834f2cbe0a3ca19c31b3f6.png)
(3)求
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/c8ff1ddf63dd4cfb9575583ed3107847.png)
![](https://img.xkw.com/dksih/QBM/2015/1/12/1571958740541440/1571958746202112/STEM/ba13ca1cff5b458fbb3f1a32761f74cb.png)
更新时间:2016-12-03 08:21:10
|
相似题推荐
解答题-证明题
|
适中
(0.64)
【推荐1】在底面为正三角形的三棱柱
中,
,
平面
,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572938347855872/1572938353819648/STEM/3386b941d0c449a186dd3d221c763424.png)
(1)求证:
平面
;
(2)若
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19434b67703318b18be7efee7be590bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b74373a614731cbf61af14e6e0dae21b.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572938347855872/1572938353819648/STEM/3386b941d0c449a186dd3d221c763424.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f233b375753611ffa7a93c2c12ef5e28.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf90bac174f02c4552e56df4d910bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc338e9d0568d2e4f54e46c5aa5256e9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】如图,已知矩形
所在平面外一点
,
平面
,
分别是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/d3b8e0a3fb844e919fffb03358e9a855.png)
(1)求证:
平面![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/8e2c6498ad5944849edf50f9ed0d2f75.png)
(2)若
,求直线
与平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/5e667e00444e48828293dbef2aef20c6.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/8b398a37c271448094cad55ce34a818d.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/cc63ee5ea7944ce2b5c840768ac21381.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/5e667e00444e48828293dbef2aef20c6.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/fc76f8ec59614e70b7e51d35c8b87e50.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/b0c9a50d25524b20860814c5f5ef2b2c.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/35c8c45e7be7462284d0104543d6a1ea.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/d3b8e0a3fb844e919fffb03358e9a855.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/8e2c6498ad5944849edf50f9ed0d2f75.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/d0df6c595b054337987bc9fdbeb0f1e9.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/ca00837468ce47d1b7ac8846a2fa56b1.png)
![](https://img.xkw.com/dksih/QBM/2015/10/27/1572266719952896/1572266725859328/STEM/d745cf747c8744a8b0b2f374e17deea0.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在
中,
,斜边
.
以直线
为轴旋转得到
,且二面角
是直二面角,动点
在斜边
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/006b5b27-3114-44aa-8b60-393a0cf85ee3.png?resizew=152)
(1)求证:平面
平面
;
(2)当
时,求异面直线
与
所成角的正切值;
(3)求
与平面
所成最大角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c633830c6e2ac6d8d6e18890ef5ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b10a7cfa7063078668323401b0084cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c633830c6e2ac6d8d6e18890ef5ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864aa0f490f42c358d1550c99bd81c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19c1bcb8431ae315ecd29c6478d3eff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/5/006b5b27-3114-44aa-8b60-393a0cf85ee3.png?resizew=152)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a55c40bb7437081d8e669974c8d1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8bc55e0db891bb32a8098c29116d79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】如图,在四棱锥P-ABCD中,AD∥BC,AB⊥AD,E是AB的中点,AB=AD=PA=PB=2,BC=1,
PC=
.
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572518468640768/1572518474481664/STEM/c0b14b0384ce4f3991071374d05c559c.png)
(1)求证:CF∥平面PAB;
(2)求证:PE⊥平面ABCD;
(3)求二面角B-PA-C的余弦值.
PC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572518468640768/1572518474481664/STEM/c0b14b0384ce4f3991071374d05c559c.png)
(1)求证:CF∥平面PAB;
(2)求证:PE⊥平面ABCD;
(3)求二面角B-PA-C的余弦值.
您最近一年使用:0次
【推荐1】如图,矩形ABCD中,AB=4,AD=2,E在DC边上,且DE=1,将
沿AE折到
的位置,使得平面
平面ABCE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5efd860f-72e2-4c06-8b4b-da8df17bba7e.png?resizew=223)
(1)求证:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68696b781af2609327222d22cb7bab3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b348d4333ecdfc3e3b1ba16dc312550d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5efd860f-72e2-4c06-8b4b-da8df17bba7e.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ced76e1ee551955a877688618b1f4ad.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b030b5ae84f25d419cd8ef20d5b5cfd2.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在四棱台
中,底面
为菱形,
.
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872481183645696/2878218847035392/STEM/e56211e7-d7d1-4da7-8b36-f51fa4cc1a73.png?resizew=231)
(1)证明:
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37bf1126db7a5e35f36393836476b7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90b10ae50e3cf8663038cdeb697168c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a61472439de1ba85cfe33840b775f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75124aeae28f3fb6927aed48809eaabd.png)
![](https://img.xkw.com/dksih/QBM/2021/12/14/2872481183645696/2878218847035392/STEM/e56211e7-d7d1-4da7-8b36-f51fa4cc1a73.png?resizew=231)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d0f0cd1f94cea4aec68e4d830bed54.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379c7b2495bdfcac49c1979bb14bcf5e.png)
您最近一年使用:0次