名校
1 . 如图,四面体
中,
,
,
,
为
的中点.
(1)证明:平面
平面
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/09cb7873-7e7a-4566-a503-a02594efb0df.png?resizew=230)
(2)设
,
,点
在
上;
①点
为
中点,求
与
所成的角的大小;
②当
的面积最小时,求
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2aca1bdb9459855415e292e73de50ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f5ba965420dfd5aa4da211682df096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/09cb7873-7e7a-4566-a503-a02594efb0df.png?resizew=230)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a05e0ab55e325fb3b85fc8ca9c27c76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36691f0269294ecae8f00b7bce97756c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.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
|
3466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
3 . 如图,在三棱台
中,
,
,
为
的中点,二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/27d9a8c0-8a90-41b9-b258-50a946d9d5e0.png?resizew=189)
(1)证明:
;
(2)当
为何值时,直线
与平面
所成角的正弦值为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c01138acca46627f2dc26aeb95b4da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecca74150d296707924bad9ce67be9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/27d9a8c0-8a90-41b9-b258-50a946d9d5e0.png?resizew=189)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf21399dcf3682bf5d3f9cbd5eed86c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6480f384476190883f06c0289c7519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aace91caec728e174daec29a3568ae.png)
您最近一年使用:0次
2020-01-05更新
|
3643次组卷
|
4卷引用:【新东方】杭州高二数学试卷237
(已下线)【新东方】杭州高二数学试卷237湖北省武汉外国语学校2020-2021学年高一下学期期末数学试题河南省南阳市第一中学校2023-2024学年高三上学期开学考试数学试题(已下线)专题15 立体几何解答题全归类(9大核心考点)(讲义)-2
4 . 如图,在四棱锥P-ABCD中,PA⊥底面ABCD,AB⊥BC,BC∥AD,AB=BC=1,AD=2,M是PD的中点.
![](https://img.xkw.com/dksih/QBM/2016/8/16/1572977511555072/1572977517707264/STEM/7b29ceb9b6a9453fb3f174cbd60dab30.png)
(1)求证:CM∥平面PAB;
(2)求证:CD⊥平面PAC;
(3)线段AD上是否存在点E,使平面MCE⊥平面PBC?说明理由.
![](https://img.xkw.com/dksih/QBM/2016/8/16/1572977511555072/1572977517707264/STEM/7b29ceb9b6a9453fb3f174cbd60dab30.png)
(1)求证:CM∥平面PAB;
(2)求证:CD⊥平面PAC;
(3)线段AD上是否存在点E,使平面MCE⊥平面PBC?说明理由.
您最近一年使用:0次
5 . 如图,在三棱柱
中,面
为矩形,
,
,
为
的中点,
与
交于点
,
面
.
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/649a084b9aa14f19b022e0938e08589f.png)
(Ⅰ)证明:
;
(Ⅱ)若
,求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/9ca2241531f04bc7b0791923af54fd4f.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/a9889751a63a470d82be80fb915d575a.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/7964df7c8c2e45c8bb43ff29999240ba.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/9580db7fffd3425bb740189a067b9c9d.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/7d973141dbc948d39df54ac7d1033abd.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/6522d53f0fce4ea8a23f11e93dbaf233.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/4298ebf1b8bc4602a9aeaf4c64a94552.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/80ece00fc3db42218cf955c70e2c31f3.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/cac308596319424485f1d5d2b0b3d8b8.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/29e3ec14b16e429abf5e9c4199011ce4.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/a9889751a63a470d82be80fb915d575a.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/649a084b9aa14f19b022e0938e08589f.png)
(Ⅰ)证明:
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/82b7dfaf316441a28ad38d7cff32962c.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572188135432192/1572188140789760/STEM/7804562539f744409e3c944a84f8c3c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7a8697297a58e093eef336844e342b.png)
您最近一年使用:0次
6 . 如图,四棱锥
,底面
是
的菱形,侧面
是边长为
的正三角形,且与底面ABCD垂直,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572877161103360/1572877166829568/STEM/9ca9a10d50ef4509b235dc52db83ad85.png)
(I)求证:
;
(II)求直线
与平面
所成的角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56fbe4053a65b67949981f24c0d30b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b0c4c783dd55685bd3e88bb31c6696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ba122ff4fb6c7f5a107b3ec970ad43b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf5cb457a768676c10da10ccfdbb2fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f9c827e46d1a395fafbf15cdd6c6c42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/435f34602291e9e293ff64a1606e29dc.png)
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572877161103360/1572877166829568/STEM/9ca9a10d50ef4509b235dc52db83ad85.png)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac0e1293aae6c92e1d5d255cb16077f.png)
(II)求直线
![](https://img.xkw.com/dksih/QBM/2016/7/4/1572877161103360/1572877166829568/STEM/b254d2dfad62424097e4d69ebfcc3952.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fefbe52c070d8831b1d9bc8b1412b67.png)
您最近一年使用:0次
7 . 如图所示,平面![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/5859c075bcc94e22bcae3481964360ea.png)
平面
,且四边形
为矩形,四边形
为直角梯形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/e9bc455f-7bd5-4021-ae9f-e8a6ee4b81b0.png?resizew=166)
(1)求证:
平面
;
(2)求平面
与平面
所成锐二面角的余弦值;
(3)求直线
与平面
所成角的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/5859c075bcc94e22bcae3481964360ea.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/7032f504a0794f1eac53a741f4304ae5.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/a0b7af46cb504388a730638590035ef5.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/5859c075bcc94e22bcae3481964360ea.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/a063c64e629a4cab89808ceeaf3c673c.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/2632e9e1befa41f29b5efab6b81a2105.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/b86d37b07e674f3aa5f693305c9c7f38.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/53a0a1cc143444a69b09f309cd6119ff.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/de5366bbde064a79837357316b198b8d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/e9bc455f-7bd5-4021-ae9f-e8a6ee4b81b0.png?resizew=166)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/4a93e89c83d647188c7cdd4c89db2c08.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/f8151008635d43c39f05a42914536c12.png)
(2)求平面
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/07d9bdf35d58436ea5c5c84da115619d.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/b83a7baa8b11473d8f76bdfd8d720132.png)
(3)求直线
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/7db11619fe08422bb9317e87c3d990da.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496357728256/1572496363347968/STEM/07d9bdf35d58436ea5c5c84da115619d.png)
您最近一年使用:0次
8 . 已知四棱锥
中
平面
,点
在棱
上,且
,底面为直角梯形,![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/dc1a04d126e245b7978e9db0708bd83a.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/212a9e649b8b4fe1b1f9e963e242710a.png)
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/f223bb1e-f3a0-4009-9452-350a9f39b765.png?resizew=201)
(1)求证:
// 平面
;
(2)求截面
与底面
所成二面角的大小.
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/78e41c3951f44ae9bed12953b5af0e21.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/fcfae3e2fb5941a4b38679a93fbdc91f.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/e6b76701eee24dd78f6b403137fe796d.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/1547ca698ee84685bec47ab390ac2818.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/0d5c757d2c8d4ed3a1538c62e98aca52.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/692a642a25ea4f3386a9d6491130193d.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/dc1a04d126e245b7978e9db0708bd83a.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/212a9e649b8b4fe1b1f9e963e242710a.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/6617eb787baf4636a292f54fe876832e.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/4a2af18f13144f979a856efbf3f9f571.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/f223bb1e-f3a0-4009-9452-350a9f39b765.png?resizew=201)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/7b8df0584a2f44689b89e092ea1d5362.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/29e1c9e068d2413091c3a9029cf585d2.png)
(2)求截面
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/f47c36a9715048b8bea5e8e9c3bd3d51.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572470328180736/1572470333472768/STEM/e6b76701eee24dd78f6b403137fe796d.png)
您最近一年使用:0次
9 . 如图,正方形
的边长为1,正方形
所在平面与平面
互相垂直,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/40a599c4-e52f-44e3-bef3-3607dd994c7d.png)
(1)求证:
平面
;
(2)求证:
;
(3)求三棱锥
的体积.
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/cd4593287214468b9f5343d3148070c5.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/870bff5fc0584b4ea927c9c25db8d8a1.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/cd4593287214468b9f5343d3148070c5.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/bac69173fe9b402c8e6f3db24d2007ea.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/7e437572ab474dc8b91ab683b65adcc4.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/40a599c4-e52f-44e3-bef3-3607dd994c7d.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/4e37268c2f884d7f86ba1510c3ef3a7d.png)
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/a1ac04b2cf04497caf3c34b08f69eacb.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc4c50ada59b5838d296697a8e0bb8d.png)
(3)求三棱锥
![](https://img.xkw.com/dksih/QBM/2015/8/7/1572205183311872/1572205189005312/STEM/fcfaed65b36041d9bd03ff656a6b3760.png)
您最近一年使用:0次
10 . 在四棱锥
中,侧面 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
底面
,
,
为
中点,底面
是直角梯形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/2d7ef0cb-e703-42e9-a2fc-6f8c3feae52b.png?resizew=208)
(1)求证:
平面
;
(2)求证:
平面
;
(3)在线段
上是否存在一点
,使得二面角
为
?若存在,求
的值;若不存在,请述明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37002ada5d194d4d062fa3285d7d9824.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.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/90ff6d7dd48b57f03d82d2c522ee9b94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16114c73382b18f060150f2ab1f1484d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/2d7ef0cb-e703-42e9-a2fc-6f8c3feae52b.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3520ee9cc97a075e889e1625dba1157c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3142b1af4ce67d3e55417b4c0de257.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32bff9fff7a158e95a7f5041629e7a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38a22a9d3ca498f957b91b25c60a6df1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c096f1451e3e00a111dda9159f5f82a.png)
您最近一年使用:0次