如图,在四棱锥
中,
底面
,
,
,
,E为棱CD的中点.
![](https://img.xkw.com/dksih/QBM/2022/3/3/2928293731328000/2936796197748736/STEM/ab0a4e5aeecc4423b52416dc3351a20f.png?resizew=231)
(1)求直线PD与平面PBE所成角的正弦值;
(2)M为直线PA上一点,且满足
平面PBE,求线段DM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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d730ae4307db56b47849c3a19dedfb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8277767aa2d4369a8c2deb6d16f08d.png)
![](https://img.xkw.com/dksih/QBM/2022/3/3/2928293731328000/2936796197748736/STEM/ab0a4e5aeecc4423b52416dc3351a20f.png?resizew=231)
(1)求直线PD与平面PBE所成角的正弦值;
(2)M为直线PA上一点,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfacd208d769d01f1d4ef20313cd869.png)
更新时间:2022-03-15 15:50:04
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在四棱锥
中,
为等边三角形,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/dbfe6b5a-5e74-4710-9906-ed01f8c35cf8.png?resizew=218)
(Ⅰ)若点
为
的中点,求证:
平面
;
(Ⅱ)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397bf976a5d6ea47153fb564cc8ea190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822728cf620309a9d0d1bf661e964b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37d3fb7407af74cbd242f606eadd710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aaaa7abe827f3de2be324647ca92bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d918ea86001c635eeede8d3fcc3a31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/dbfe6b5a-5e74-4710-9906-ed01f8c35cf8.png?resizew=218)
(Ⅰ)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5258a6f9c63914b9e2ec95b6d39313b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3520ee9cc97a075e889e1625dba1157c.png)
(Ⅱ)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
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【推荐2】如图,在三棱柱
中,侧面
为正方形,平面
平面
,
,M,N分别为
,AC的中点.
平面
;
(2)再从条件①、条件②这两个条件中选择一个作为已知,求直线AB与平面BMN所成角的正弦值.
条件①:
;
条件②:
.
注:如果选择条件①和条件②分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaa5e336f830a3e5cd60ff7a756f3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)再从条件①、条件②这两个条件中选择一个作为已知,求直线AB与平面BMN所成角的正弦值.
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1be642ddd61c3ad26bcbe2dc42e3512.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92e54205eb911da9c0df08e4d3818077.png)
注:如果选择条件①和条件②分别解答,按第一个解答计分.
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解答题-作图题
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解题方法
【推荐1】如图,组合体由半个圆锥
和一个三棱锥
构成,其中
是圆锥
底面圆心,
是圆弧
上一点,满足
是锐角,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/581137bb-7abd-4e73-96ef-b00ce7819718.png?resizew=177)
(1)在平面
内过点
作
平面
交
于点
,并写出作图步骤,但不要求证明;
(2)在(1)中,若
是
中点,且
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44772931f0a1dd6d5b8307b7dea5bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80041fc6b5fe12e44ba5cdfabd09cc63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44772931f0a1dd6d5b8307b7dea5bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c242f5487f782a38b5984428eca3c39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/581137bb-7abd-4e73-96ef-b00ce7819718.png?resizew=177)
(1)在平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9c9cfa597b444b5c9dbae7a825a695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b6053e396df2cd152e1329fce766d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef796b46e68fe77b117ff0483d2370c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)在(1)中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f798d6f25c170205fadc3fa6ac7ea04e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
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【推荐2】如图,在长方体
中,
,
,点
在棱
上运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/1e3ec571-6ee0-47c6-b0d3-68d7f0d1489b.png?resizew=168)
(1)证明:
;
(2)设
为棱
的中点,在棱
上是否存在一点
,使得
平面
,若存在,求
的值,若不存在,说明理由;
(3)求直线
与平面
所成角的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc2ec6bad95e10dbda8f1ee4ac93362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/1e3ec571-6ee0-47c6-b0d3-68d7f0d1489b.png?resizew=168)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3af2fef79a35d44f9e11f9d8c5b3f08b.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8ccd4181f956f6e0140bf0ab8f0716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c8ae2f62d6a56f0ad6104814e73e50.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
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【推荐3】如图,在直四棱柱
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f824d5be25b3427cb62b22b462fb4927.png)
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854683026399232/2858728012980224/STEM/b211f33b-ed0b-4798-82d8-f198aa8eaa04.png?resizew=230)
(1)若
为
的中点,试在
上找一点
,使
平面
;
(2)若四边形
是正方形,且
与平面
所成角的余弦值为
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f824d5be25b3427cb62b22b462fb4927.png)
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854683026399232/2858728012980224/STEM/b211f33b-ed0b-4798-82d8-f198aa8eaa04.png?resizew=230)
(1)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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee72dbf16db9bb8b5b51576a0619c06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4755dc59cb5a03cd39879bc80fdbb9.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4755dc59cb5a03cd39879bc80fdbb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/185d41ab423da901df5b9d992b2c0ced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2facd6d61019612fec94df8b6e178e5.png)
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【推荐1】在四棱锥
中,底面
是边长为2的菱形,
,
底面
,点
、
分别是棱
、
的中点.
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731424452386816/2782435606454272/STEM/2c62ddb25113405d81e9cfb6acac7f01.png?resizew=218)
(1)证明:
平面
;
(2)在线段
上是否存在点
,使得
与平面
所成最大角的正切值为
,若存在,请求出
点的位置;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/5/29/2731424452386816/2782435606454272/STEM/2c62ddb25113405d81e9cfb6acac7f01.png?resizew=218)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6da9f598fecf6fcf41cd65b45cbe08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839c7616cd0d90265f4b2c9c021254fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
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【推荐2】如图,正方形ABCD中,边长为2,E为AB中点,F是边BC上的动点.
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189405909065728/2190170236518400/STEM/bc20d2a6-a888-4108-b2da-3c1487ebb788.png)
(1)将△ADE沿DE翻折90°到△SDE,求二面角S-DC-E的正切值;
(2)若
,将△ADE沿DE翻折到△SDE,△BEF沿EF翻折到△SEF,接DF,设直线DS与平面DEF所成角为θ,求
的最大值.
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189405909065728/2190170236518400/STEM/bc20d2a6-a888-4108-b2da-3c1487ebb788.png)
(1)将△ADE沿DE翻折90°到△SDE,求二面角S-DC-E的正切值;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a02d2174556efb22aa290918285bca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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名校
【推荐1】如图,已知四棱锥
的底面是菱形,对角线
交于点
,
,
,
,
底面
,设点
满足
.
![](https://img.xkw.com/dksih/QBM/2015/7/30/1572198128050176/1572198134472704/STEM/839d650ea602467faa4682d61173e69c.png)
(1)当
时,求直线
与平面
所成角的正弦值;
(2)若二面角
的大小为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ba1df94176a1f769c7a0a12bf357fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/637331a6bcf269d7d3487ee4cfb536f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daebfdc254732902c90bc49005684214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3527d32d80174aa1a3c03f3a809b986d.png)
![](https://img.xkw.com/dksih/QBM/2015/7/30/1572198128050176/1572198134472704/STEM/839d650ea602467faa4682d61173e69c.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec39330e8e3c7dd4391022642ae212d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a374c37bd62a8d73358e1781af7f545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa42b56b1c92689a080b58cb603a642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5fffd330dd6b9241659d790bd2a7fb2.png)
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【推荐2】木工技艺是我国传统文化瑰宝之一,体现了劳动人民的无穷智慧.很多古代建筑和家具保存到现代依然牢固,这其中,有连接加固功能的“楔子”发挥了重要作用.如图,楔子状五面体EF-ABCD的底面ABCD为一个矩形,AB=8,AD=6,EF
平面ABCD,棱EA=ED=FB=FC=5,设M,N分别是AD,BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/d77cdaaf-bb2d-4849-8f01-68a5745d2b17.png?resizew=221)
(1)证明:E,F,M,N四点共面,且平面EFNM⊥平面ABCD;
(2)若二面角F-BC-A的大小为
,求直线BF与平面EFCD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/d77cdaaf-bb2d-4849-8f01-68a5745d2b17.png?resizew=221)
(1)证明:E,F,M,N四点共面,且平面EFNM⊥平面ABCD;
(2)若二面角F-BC-A的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
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解答题-证明题
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适中
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【推荐3】如图,在正方体
中,
为棱
上的动点(不与
重合).
![](https://img.xkw.com/dksih/QBM/2022/5/29/2989865800687616/2989989820293120/STEM/9342242e-6c94-4bd3-9801-0df5892dded9.png?resizew=231)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值的取值范围.
![](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/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2022/5/29/2989865800687616/2989989820293120/STEM/9342242e-6c94-4bd3-9801-0df5892dded9.png?resizew=231)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd597851c0db4e4de4769e10e09383b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2331bccb6ebf5b9fd639df994f575a9.png)
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