名校
解题方法
1 . 如图,在三棱锥
中,
⊥底面
,
.点
,
,
分别为棱
,
,
的中点,
是线段
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/bd72c31e-a21a-45f7-9db1-0a942655b866.png?resizew=154)
(1)求证:
∥平面
;
(2)求平面PAC与平面EMN所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487b14c446e989c68d0e148cc557dbf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/bd72c31e-a21a-45f7-9db1-0a942655b866.png?resizew=154)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求平面PAC与平面EMN所成角的余弦值.
您最近一年使用:0次
2022-11-15更新
|
348次组卷
|
5卷引用:天津市蓟州区2022-2023学年高二上学期期中数学试题
名校
解题方法
2 . 如图,已知四棱锥
的底面是矩形,
平面
分别是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/f8d1fc4b-5832-4ceb-b554-5768b850ab6c.png?resizew=220)
(1)求证:
∥平面
;
(2)求平面
与平面
夹角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcf34539673d516eb9b259951a81ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a70ff6c76d1bc6ac5452c2683b8baa1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeccd599035143e06d5b57daf95f62d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98dddb34687f696f29ff1beca6f43806.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/f8d1fc4b-5832-4ceb-b554-5768b850ab6c.png?resizew=220)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c04c251140836bddf638b36de537c21.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848a42a54e9504c159eae24175a5bcc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aadc425b2c77dd34979b30237c4c815a.png)
您最近一年使用:0次
2022-12-19更新
|
418次组卷
|
6卷引用:天津市崇化中学2022-2023学年高二上学期期末数学试题
天津市崇化中学2022-2023学年高二上学期期末数学试题黑龙江哈尔滨工业大学附属中学校 2021-2022学年高二下学期期末文科数学试题(已下线)专题02 空间向量与立体几何大题专项练习浙江省湖州市2021-2022学年高一下学期期末数学试题黑龙江省大庆市大庆中学2022-2023学年高二下学期开学考试数学试题(已下线)天津市耀华中学2024届高三上学期第一次月考数学试题变式题16-20
解题方法
3 . 如图,在棱长是2的正方体
中,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/b7058723-e429-4b49-8d2d-6ff90a45309b.png?resizew=177)
(1)求证:
;
(2)求异面直线
与
所成角的余弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/b7058723-e429-4b49-8d2d-6ff90a45309b.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c82199be341703d72cff4a4635b558.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dc61d5de97b5a40be925b278ae494c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
您最近一年使用:0次
4 . 如图所示,在三棱柱
中,
和
都是边长为2的正方形,平面
平面
,点G、M分别是线段AD、BF的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/f28a09ea-34a5-4834-baf4-4d73fae66770.png?resizew=149)
(1)求证:
∥平面
;
(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb84cc7d5f7b10fac5fe3183c649a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/f28a09ea-34a5-4834-baf4-4d73fae66770.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cc4309dcef077fbcf60099f47b7b37.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cc4309dcef077fbcf60099f47b7b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解题方法
5 . 已知在直三棱柱
中,
,且
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/8e0529dd-d2da-4ad8-a33f-083804d2a16f.png?resizew=183)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
平面
;
(2)求直线
与平面
所成角的正弦值;
(3)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667661dd4aba3a7564b286fda89f4491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/8e0529dd-d2da-4ad8-a33f-083804d2a16f.png?resizew=183)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce1b066f8869d0ff4513f7a99745125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b43cbc92b5f5c26c7f70b52b27616a81.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43819ab7b268a6293a9251935b594690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14373a1c5a966e9f0af94d7786784a5.png)
您最近一年使用:0次
名校
解题方法
6 . 如图,在四棱锥
中,
平而![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fbf67128b7cf1adff7a2f4094e22b65.png)
为
的中点,
在
上,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d74b1d0480790400a9223e4437afdba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/2c17dea0-197e-4d68-8478-a448ca8d7aee.png?resizew=175)
(1)求证:
平面
;
(2)求平面
与平面
所成二面角的正弦值;
(3)点
是线段
上异于两端点的任意一点,若满足异面直线
与
所成角的余弦值为
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fbf67128b7cf1adff7a2f4094e22b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51913927aa2eaa88593f6832740cf7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d74b1d0480790400a9223e4437afdba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/2c17dea0-197e-4d68-8478-a448ca8d7aee.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc22fde9c06a220f208466c57156409d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
2023-01-12更新
|
685次组卷
|
3卷引用:天津市静海区第一中学2022-2023学年高三上学期期末数学试题
天津市静海区第一中学2022-2023学年高三上学期期末数学试题天津市2023届高三高考前最后一卷数学试题(已下线)专题06 用空间向量研究距离、夹角问题10种常见考法归类 - 【考点通关】2023-2024学年高二数学高频考点与解题策略(人教A版2019选择性必修第一册)
解题方法
7 . 如图,正三棱柱
中,
是
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/d3165386-5862-4cb2-b5a4-1ed8650c398d.png?resizew=237)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
平面
;
(2)若
,
,求点
到平面
的距离;
(3)当
为何值时,二面角
的正弦值为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/d3165386-5862-4cb2-b5a4-1ed8650c398d.png?resizew=237)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba99277e38f8d9f817a9d7db8198219.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef8866ccf160ddc441bf69c5d3a3d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba99277e38f8d9f817a9d7db8198219.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b8473a3d4030dfbfca3008b854957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1c3247d415eaba5e8fe835692b6b4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
您最近一年使用:0次
名校
8 . 如图,在四棱锥
中,
平面
,且
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/28deb8a2-c51f-4e0b-a26f-6df6c2787009.png?resizew=254)
(1)求证:
平面
;
(2)求平面
与平面
所成锐二面角的余弦值;
(3)在线段
上是否存在一点
,使得直线
与平面
所成角的正弦值为
,若存在,求出
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcf75eebbbc06b7571c869debc3db6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e644091cf2bd990f0f3b54bd9158537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b04a4e21e012c13d4bc2291f62d64219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/8/28deb8a2-c51f-4e0b-a26f-6df6c2787009.png?resizew=254)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250833a6c405ffd724b673b478c22919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585a36dc7fe184aa99338bb2ecf1b7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d0c164c2464bbee10ab60a0d2e21c1.png)
您最近一年使用:0次
2022-10-05更新
|
2900次组卷
|
26卷引用:天津市第二南开学校2022-2023学年高二上学期9月阶段性线上练习数学试题
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名校
解题方法
9 . 在正四棱柱
中,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/63b5fa7f-38f1-40bf-9429-eebe92024a5c.png?resizew=183)
(1)求证:
平面
.
(2)若
为
中点,求直线
与平面
所成角的正弦值,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8344274eb05401d0c50c8171b662b0e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/63b5fa7f-38f1-40bf-9429-eebe92024a5c.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4557a368725226f2c8ea2efb7d30e478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35f348ed8a1690d3ed02aa64459ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
您最近一年使用:0次
2022-10-04更新
|
1146次组卷
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9卷引用:天津市翔宇力仁学校2022-2023学年高二上学期教与学反馈(一)数学试题
天津市翔宇力仁学校2022-2023学年高二上学期教与学反馈(一)数学试题重庆市广益中学校2022-2023学年高二上学期10月月考数学试题(已下线)第07讲 向量法求距离、探索性及折叠问题 (高频考点—精讲)湖南省湘西州吉首市2022-2023学年高二上学期基础教育综合实践改革成果展示活动检测数学试题福建省泉州市石狮市第八中学2022-2023学年高二上学期第一次月考数学试题吉林省辽源市友好学校2022-2023学年高三上学期期末联考数学试题湖南省常德市第一中学2022-2023学年高二下学期期中数学试题安徽省合肥市第一中学2023-2024学年高二上学期数学素质拓展5试题湖南省张家界市民族中学2023-2024学年高二上学期第四次月考数学试题
名校
解题方法
10 . 已知椭圆
:
的右焦点和上顶点均在直线
上.
(1)求椭圆
的方程;
(2)已知点
,若过点
的直线
与椭圆
交于不同的两点
,
.直线
和直线
的斜率分别为
和
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad7451b947d1adea22bc04070efdd2b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85698e3df712bae578da81b1e55d8922.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8213d686f48c855a41eb94b9ede1f90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22a081d97d0f2cd61d76d3a07370aba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a159de0b2d9eb1ae0b7e664e64d3c6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2562424a83aae7e4b3f8adf90307961a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b58edb637c5dfa03794f3952de9d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8869f1b1c62e8e88f528a38d6d71968a.png)
您最近一年使用:0次
2022-10-26更新
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853次组卷
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3卷引用:天津市第四十七中学2022-2023学年高三上学期单元随堂测试数学试题