1 . 已知椭圆
的左、右焦点分别为
和
,经过点
且斜率为k的直线l交椭圆
于B,C两点,其中点C在第二象限.如图所示,将
的上半部分(半椭圆)沿着长轴翻折使得点C翻折至点A且二面角
为直二面角.设三角形
和三角形
的周长分别为
和
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/18/ba44a91d-f312-406b-b629-1d8e0330619f.png?resizew=335)
(1)证明:
;
(2)若
,求异面直线
和
所成角的大小;
(3)若
,求k的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f639240bf9ab7a9a68e779cd51ab2641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5465c4f86cbc6cc2c9ba7adbc2060b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045a830b449a9b95a51688c63d80ba15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef419f0740dae5db5cc51675bc51afb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1256c57833e0d2d6b58e7fa20576eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a94cde8f1ae6799f3fe64ed059b485fc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/18/ba44a91d-f312-406b-b629-1d8e0330619f.png?resizew=335)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800ce9c8dfb28051661e98015f4041c2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f247c2d094e3a2b5df9178d5f55fbf39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86dbcf83cd5d3421b3eed7be7dab32d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbad65b3d744b70da2480eee1cdb587.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a065ed0c5b57b6be8f3be52249c33f.png)
您最近一年使用:0次
名校
解题方法
2 . 如图,斜三棱柱
中,
,
为
的中点,
为
的中点,平面
⊥平面
.
平面
;
(2)设直线
与直线
的交点为点
,若三角形
是等边三角形且边长为2,侧棱
,且异面直线
与
互相垂直,求异面直线
与
所成角;
(3)若
,在三棱柱
内放置两个半径相等的球,使这两个球相切,且每个球都与三棱柱的三个侧面及一个底面相切.求三棱柱
的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1638cde11c9862af200115048a0177da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53cdc56590b42b154608b4cf19462fa0.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e190568dc620895856a72fca1a08ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/770da0f9a22d31e40431208bb33ab8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
您最近一年使用:0次
2022-11-29更新
|
3477次组卷
|
7卷引用:上海市复旦大学附属中学2021-2022学年高一下学期期末数学试题