在如图所示几何体中,四边形
为正方形,
为等腰直角三角形,
,且
.
![](https://img.xkw.com/dksih/QBM/2016/6/13/1572736916054016/1572736922443776/STEM/2f33fdcd9a5442e0a0d96f4cfda89a8b.png)
(1)证明:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73d6dde62cacc0d1fc589d3f1565304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcab4af0027d2c13e612a29ae71ae8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f317bb854bddadef28a66a07d74e4b8f.png)
![](https://img.xkw.com/dksih/QBM/2016/6/13/1572736916054016/1572736922443776/STEM/2f33fdcd9a5442e0a0d96f4cfda89a8b.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafb7a5d0646407ad0bd9762b7608473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
更新时间:2016-12-04 10:44:22
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在正四棱柱
中,
,
,点E在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/36b7c9c5-93c0-420d-bc95-978916c89755.png?resizew=164)
(1)求异面直线
与
所成角的正切值:
(2)求证:
平面DBE;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc81d42ad20eb0b0ca0807e5a4c3ceb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eff61c4351ab84330a6cd309621a7da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4893fbcb191420e06a239e63493626f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e97fcdcfd6183b976a61ef3222c607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/36b7c9c5-93c0-420d-bc95-978916c89755.png?resizew=164)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1859959fdb4c5edd8056893f94a10a0.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/628d6fc46c651e0c783b81a123a7b229.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,正四棱锥
的底面是边长为
的正方形,侧棱长是底面边长为
倍,
为底面对角线的交点,
为侧棱
上的点.
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572678718840832/1572678724558848/STEM/a58cd40573e340deac42ab4370134efb.png)
(1)求证:
;
(2)
为
的中点,若
平面
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5aa0d36da718de7c50a781b8e2bb8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572678718840832/1572678724558848/STEM/a58cd40573e340deac42ab4370134efb.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d785b183d9b7ddf4f9f60ca49a2fc3ba.png)
(2)
![](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/1ab3cc5d6891b01c98e1429da8a58d4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐1】如图,四棱锥
中,平面
平面
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/c3df71ce17fe4e91a398ed0bb41a76af.png)
(1)求证:
平面
;
(2)求直线
和平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/8de8ff9935124a778f298ccb9b7851c7.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/b0c4a808f3a84baf94ddd9184d585234.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/63dd73c7352f4581844e0fe7fcd7c1ad.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/46e2c6d126ec4fefb9e953c1bda3d724.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/fd7c255eb1124515a291d6b116fff951.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/197ea3d136914c2296442dc7b19b37bf.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/c3df71ce17fe4e91a398ed0bb41a76af.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/4ce21b0b96164d879a87f674d78e3c8a.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/fcda2c8183a54f6f879eacf13fde9378.png)
(2)求直线
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/93f0f818ec6e455d93d7381a830cded1.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572685908099072/1572685913980928/STEM/55b12b6f827c4ba3868e12013958bce0.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.64)
【推荐2】在四棱柱
中,底面
是菱形,且
.
(1) 求证:平面
平面
;
(2)若
,求平面
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648f3a97ada2e36b3933c1b799dee3e4.png)
(1) 求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c53647b9072e89d95914d7b532ff18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc1c04946340198af69170d4ebd4b42.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8510133b8aca1b63b25a86ee39d5bf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fefd737df2c1884834312b4c4f1a16c.png)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573175827456000/1573175833427968/STEM/10c5c53abca240be8a9d9bb22ec80c82.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】已知
平面
,
,
,
分别为
,
上的点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/b8eb0656-1276-42ee-86f2-b4d4065469ce.png?resizew=146)
(1)求证:
;
(2)若
,直线
与平面
所成角的正弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdfa54114f04a75b8c96165b3718ed7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4486d52b6e410fd7b60428121d96cef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/b8eb0656-1276-42ee-86f2-b4d4065469ce.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d03c2639a3b3f1f9590080b38ab21374.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/526908dfb46cf151b8ab1492a9d52047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12289cb9344240cbe0d0994e3a41a0d5.png)
您最近一年使用:0次