名校
1 . 如图,在四棱柱
中,四边形
是平行四边形,
,
,
,
,
为
的中点,且
.
(1)求证:
平面
;
(2)若平面
与平面
的夹角的余弦值为
,求三棱锥
的体积.
![](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/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c078a10649b3a953631690021aa59879.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fc4baf66de980a95f267051e6b190d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/f1a7d905-8650-42ac-910a-75b64a3ee109.png?resizew=155)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6ab0386dde0643de8caf33f946072f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/924d32b574fe69e43724304cf39513e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35ac94f0ea5d79ae4530f5a3116f670.png)
您最近一年使用:0次
2023-10-13更新
|
895次组卷
|
3卷引用:四川省成都市第四十九中学校2023-2024学年高二上学期期中数学试题
名校
2 . 如图,直三棱柱
中,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/9fd1e6f0-0243-4aed-8d51-98b4d64c2ea3.png?resizew=192)
(I)若
为
上的一点,且
与直线
垂直,求
的值;
(Ⅱ)在(I)的条件下,设异面直线
与
所成的角为45°,求直线
与平面
成角的正弦值.
![](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/eeed487430a5b8a330f2d0c52166521a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/9fd1e6f0-0243-4aed-8d51-98b4d64c2ea3.png?resizew=192)
(I)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbd338233af4b4df188757fbf642098f.png)
(Ⅱ)在(I)的条件下,设异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
您最近一年使用:0次
2019-05-13更新
|
5272次组卷
|
8卷引用:四川省简阳市阳安中学2020-2021学年高二9月月考数学试题
名校
3 . 已知椭圆
的左、右焦点分别为
、
,第一象限内的点
在椭圆上,且满足
,点
在线段
、
上,设
,将
沿
翻折,使得平面
与平面
垂直,要使翻折后
的长度最小,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef7fdc321551444b54aad83d10128502.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b490e09248ea3242ec67afae8d00c18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/f12dbc34a442e7161f9ac15b39547c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42fc33bcfc63ec2f4940ccd3f862400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589e32ceb302a6b21faa2b9835e05096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceb1d97878dcc984d76f48dd85decdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdfc6a59392d1ac3cd89ddc0308864c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-06-10更新
|
1519次组卷
|
9卷引用:四川省成都市第七中学2021-2022学年高二下学期期中数学理科试题
四川省成都市第七中学2021-2022学年高二下学期期中数学理科试题安徽省宣城市第二中学2021-2022学年高二下学期期末模拟数学试题(已下线)专题27 椭圆(讲义)-2023年高考一轮复习精讲精练宝典(新高考专用)(已下线)考点7-4 范围与最值(文理)(已下线)专题10 椭圆、双曲线与抛物线黑龙江省哈尔滨德强学校2022-2023学年高二(清北AB班)上学期期中考试数学试题(A卷)福建省晋江市第一中学2022-2023学年高二上学期期中考试数学试题(已下线)模块八 专题7 以解析几何为背景的压轴小题江西省丰城中学2022-2023学年高一(创新班)上学期期末数学试题
名校
解题方法
4 . 在①
,②
,③
,这三个条件中选择一个,补充在下面问题中,并给出解答
如图,在五面体
中,已知___________,
,
,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/3bdae97f-1469-4747-829f-667660e2fca3.png?resizew=212)
(1)求证:平面
与平面
;
(2)线段
上是否存在一点
,使得平面
与平面
夹角的余弦值等于
,若存在,求
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57cb0d726cc25a350dc792b539ff2f2.png)
如图,在五面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc22c901160e072ae13a66f62c489f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05426a41ec7b22c0445bfe78d786c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7422660f0635be92e11838af5f4b4b5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/3bdae97f-1469-4747-829f-667660e2fca3.png?resizew=212)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5f0cfc1049f84a04c81bd213afb8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/293a2e244834864e78e93d8c13be6905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72acf5ee54c89dede4358c61ecd7a101.png)
您最近一年使用:0次
2021-12-22更新
|
2294次组卷
|
7卷引用:四川省成都市石室中学2021-2022学年高三下学期第三次诊断性考试数学(理)试题
四川省成都市石室中学2021-2022学年高三下学期第三次诊断性考试数学(理)试题浙江省杭州第二中学滨江校区2021-2022学年高二上学期期中数学试题山西省运城市2022届高三上学期期末数学(理)试题重庆市第八中学2022届高三下学期调研检测(五)数学试题(已下线)数学-2022届高三下学期开学摸底考试卷(山东专用)(已下线)北京市丰台区2023届高三下学期3月一模数学试题变式题16-21江苏省扬州市2024届高三上学期期初模拟数学试题
名校
解题方法
5 . 如图,在长方体
中,
,动点
分别在线段
和
上.给出下列四个结论:
①存在点
,使得
是等边三角形;
②三棱锥
的体积为定值;
③设直线
与
所成角为
,则
;
④至少存在两组
,使得三棱锥
的四个面均为直角三角形.
其中所有正确结论的序号是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbff493a22d755c6b473513e2e39ecc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
①存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d212fd7c01f61338e720ab1663ef1c85.png)
③设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/408871c2b71ef88d6f556ce53cf73cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bb9697573f2076cae7ecf850152e04.png)
④至少存在两组
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7b9d439771d35f8ff433223b6f5785.png)
其中所有正确结论的序号是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/b856b93d-7404-47ce-84eb-80a911a05b7d.png?resizew=188)
您最近一年使用:0次
2023-05-30更新
|
592次组卷
|
3卷引用:四川省广安友谊中学2022-2023学年高二下学期5月月考理科数学试题
名校
6 . 如图,圆台
的轴截面为等腰梯形
,
,B为底面圆周上异于A,C的点.
(1)若P是线段BC的中点,求证:
平面
;
(2)设平面
平面
,
与平面QAC所成角为
,当四棱锥
的体积最大时,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e53b212640dadf751ef7f65a78a209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf58eb18155abf2280c2bae876bc7722.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/28/1b963630-f0d3-4d0e-8d28-372b9c80c264.png?resizew=189)
(1)若P是线段BC的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8759f11769105049212e1f52aedbb3d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc9ffc43a56921fe79f8602636b8b0f.png)
(2)设平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afe4c782983a3ab600a49c3d998ef38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7658aa955777112fae5cc107b4c6e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a0c82028e1259f300facd32775a15e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
您最近一年使用:0次
7 . 如图,直角梯形
,
,
,
,
是边
中点,
沿
翻折成四棱锥
,则点
到平面
距离的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7d528d7d5aea71bb3d9df16055c2a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae9bd3db15b3c5062240b4438fe6476.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-05-14更新
|
3739次组卷
|
16卷引用:2020届四川省棠湖中学高三下学期第一次在线月考数学(理)试题
2020届四川省棠湖中学高三下学期第一次在线月考数学(理)试题2020届四川省棠湖中学高三下学期第一次在线月考数学(文)试题【校级联考】东北三省三校(辽宁省实验中学、东北师大附中、哈师大附中)2019届高三第三次模拟考试数学(理)试题【校级联考】东北三省三校2019届高三第三次模拟考试数学(文)试题(已下线)专题25 立体几何中的最值,探索性问题-冲刺2020高考跳出题海之高三数学模拟试题精中选萃(已下线)专题23 空间角与距离-冲刺2020高考跳出题海之高三数学模拟试题精中选萃2020届湖南省株洲市第二中学高三下学期线上自主测评理科数学试题(已下线)狂刷36 直线、平面垂直的判定与性质-学易试题君之小题狂刷2020年高考数学(理)(已下线)专题06 立体几何(理)第一篇-备战2020高考数学黄金30题系列之压轴题(新课标版)2020届湖南省株洲市第二中学高三下学期4月高考模拟数学试题(已下线)专题06 立体几何(文)第一篇-备战2020高考数学黄金30题系列之压轴题(新课标版)(已下线)第3章 空间向量与立体几何(基础卷)-2020-2021学年高二数学课时同步练(苏教版选修2-1)苏教版(2019) 必修第二册 过关斩将 第13章 13.2.3 直线与平面的位置关系 第3课时 距离、直线与平面所成的角浙江省宁波市2022-2023学年高二下学期期末数学试题(A)(已下线)第二章 立体几何中的计算 专题二 空间距离 微点2 点到平面的距离(一)【培优版】(已下线)高一下学期期末复习选择题压轴题二十三大题型专练(2) -举一反三系列(人教A版2019必修第二册)
名校
8 . 如图所示,在四棱锥P-ABCD中,AB//CD,
,
,点E,F分别为CD,AP的中点.
(2)若PA
PD,且PA=PD,面PAD
面ABCD,求二面角C-BE-F的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3932e4b73dd3cf4fd52e09052cd28e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32692ff169d7eb1183c33bb238f16684.png)
(2)若PA
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
您最近一年使用:0次
2022-01-16更新
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1108次组卷
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7卷引用:四川省成都市石室中学2022届高三上学期期末数学(理)试题
四川省成都市石室中学2022届高三上学期期末数学(理)试题湖南省郴州市2021届高三下学期3月第三次教学质量监测数学试题(已下线)专题3.6 空间向量与立体几何-2021年高考数学解答题挑战满分专项训练(新高考地区专用)广东省潮州市2022届高三上学期期末数学试题(已下线)专题8-5 立体几何大题15种归类(平行、垂直、体积、动点、最值等非建系)-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)福建省宁德第一中学2022-2023学年高二下学期3月月考数学试题(已下线)湖南省长沙市四县区2024届高三下学期3月调研考试数学试题变式题11-15
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解题方法
9 . 近期,贵州榕江“村超”火爆全网,引起足球发烧友、旅游爱好者、社会名流等的广泛关注.足球最早起源于我国古代“蹴鞠”,被列为国家级非物质文化,蹴即踢,鞠即球,北宋《宋太祖蹴鞠图》描绘太祖、太宗和臣子们蹴鞠的场景.已知某“鞠”的表面上有四个点A、B、C、D,连接这四点构成三棱锥
如图所示,顶点A在底面的射影落在
内,它的体积为
,其中
和
都是边长为6的正三角形,则该“鞠”的表面积为______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c381c6106431f6ec3144a9c1eed1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2023-09-14更新
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452次组卷
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4卷引用:四川省德阳市绵竹中学2023-2024学年高一下学期第三次(6月)月考数学试题
四川省德阳市绵竹中学2023-2024学年高一下学期第三次(6月)月考数学试题湖南省湘西土家族苗族自治州2022-2023学年高一下学期期末数学试题8.6.3平面与平面垂直练习(已下线)专题08立体几何期末14种常考题型归类(2) -期末真题分类汇编(人教B版2019必修第四册)
10 . 已知双曲线
的左右焦点分别为
,
,点
是双曲线右支上一点,满足
,点
是线段
上一点,满足
.现将
沿
折成直二面角
,若使折叠后点
,
距离最小,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a54099108fd9bbeed602a46ab32c9ea8.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a53e56e7eb84db97122c4c615e32123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643ef7d761de0e794fc39937dc72ac6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2484a8e95dc08458877d0523a5ef10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42fc33bcfc63ec2f4940ccd3f862400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0447080451da5404ff47078587fb09.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/e5085e3cdef9ea6c564e079f745d6fdb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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