在
中,
,
,过点A作
,交线段BC于点D(如图1),沿AD将
折起,使
(如图2)点E,M分别为棱BC,AC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/29/95b555c6-55f4-4d0e-abca-754e543a6214.png?resizew=256)
(1)求证:
;
(2)求三棱锥
的体积最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a20cb14fea4a7cad4b7775a3dd67df9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/29/95b555c6-55f4-4d0e-abca-754e543a6214.png?resizew=256)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73038c8fab9ef31d42b3ee0631b3dd1c.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
2023·新疆乌鲁木齐·三模 查看更多[2]
更新时间:2023-04-29 11:37:21
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相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】已知函数
,在点
处的切线方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca8e3b654909a9d5e1cf044fc3ee49d.png)
(1)求函数
的解析式;
(2)若过点
,可作曲线
的三条切线,求实数
的取值范围;
(3)若对于区间
上任意两个自变量的值
,
,都有
,求实数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12213e4934e83ca5e85e975391ec9f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5828873f8369183faf71181cda5b61d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca8e3b654909a9d5e1cf044fc3ee49d.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82126b08a972ad17a2651cbeb1ca7c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若对于区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ead3fdcb8fe8f5eb3dbe7d96cabc28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0027537e96fc9e41ac9ad4124f56bd70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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【推荐2】已知函数
.
(1)若
,求
的最小值;
(2)若
的图象与直线
在区间
上有两个不同交点,求a的取值范围.
参考数据:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4106c4abb70b3f578fb106c2163a9b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af31a8d791f28399fc13be3250136dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7160d93f92089ef36f3dab809d3114b8.png)
参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af36b8a5f7fb24a5b7ea1f46ac92b886.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,在正三棱柱
中,
分别为
的中点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90679c1da6d9ae95be8b05402d98a14b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/06483619-d6df-4a35-8175-a8d072773346.png?resizew=214)
求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd5ab9babc22071881fdb0e063e38db.png)
求
三棱锥的体积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a898391acfefad6656a81913f51d0255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa0ea4953b20aa3eb352fdb9cd166eb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90679c1da6d9ae95be8b05402d98a14b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/06483619-d6df-4a35-8175-a8d072773346.png?resizew=214)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/604743d5b9f20b729c270772ba67e646.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a779876cdfb2c489ad0eaed0f73e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd5ab9babc22071881fdb0e063e38db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45c99060b135161e3375a79ead75288b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4220ca04473088f64a5fce77b94cca9e.png)
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解题方法
【推荐2】如图,四边形
是边长为2的正方形,平面
平面
,
,
,
,
.
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3e927b7b2383ccded03838ae8b30b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4dc4d7d30af1cdce660795e0fd7d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/10/03500e93-7db9-4651-b6ac-912eeeb84db1.png?resizew=124)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35b3671adbe86df7b0e40a4f94b4062.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐1】如图,边长为4的正方形
中,点
分别为
的中点.将
分别沿
折起,使
三点重合于点P.
;
(2)求三棱锥
的体积;
(3)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa7d487586e3702f55cd2d6466654bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d36dd59982f1c429b4b3fbb1f4a8478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1568545372293e8b909d3679e584f1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495db245d8dcd369c8d0076c0fd258cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02e2557d6c0eeb8e56c84db1c4931c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6969b9971ceae406072933356189a897.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd5a77397737cc1c3cf2da39ee064d29.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079c2c3d9fe3c7d6d7faf896273cce90.png)
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【推荐2】如图,在三棱锥
中,平面
平面
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/805d745a-7f0e-4e98-8aad-720ec6a9982b.png?resizew=202)
(Ⅰ)证明:
平面
;
(Ⅱ)若线段
上的点
满足
,求棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245236ad0a1f16fe63e6e846b0584435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/036de574712cad14bddadf6653c7e714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/805d745a-7f0e-4e98-8aad-720ec6a9982b.png?resizew=202)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(Ⅱ)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d084a8ddeec6da3f544a21b597fb79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9774e97e6cd52fcb0ce3a40cdc9dc5.png)
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解答题-证明题
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名校
【推荐1】如图,在四棱锥
中,
平面
且
,
.
![](https://img.xkw.com/dksih/QBM/2022/2/14/2916349056720896/2945868646752256/STEM/9a3a7a34a42c4448ad23a39be341a933.png?resizew=288)
(1)求证;
,
(2)在线段
上是否存在一点M,使得二面角
的大小为
,如果存在,求
与平面
所成角的正弦值;如果不存在,请说明理由.
![](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/346847909ef6b91d62b6a0e28f5e03a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb60e93b17f012f389a229f96dc2998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://img.xkw.com/dksih/QBM/2022/2/14/2916349056720896/2945868646752256/STEM/9a3a7a34a42c4448ad23a39be341a933.png?resizew=288)
(1)求证;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698335f4880c7a298f4898c83b6562bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb304d905125170bebfada27e7ed8960.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面ABCD为矩形,平面
平面ABCD,
,
,E,F分别为AD,PB的中点.
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882847505612800/2889839222472704/STEM/eb2d90f6036e4aea829317722b955274.png?resizew=234)
(1)求证:
;
(2)求证:EF
平面PCD;
(3)若
,求PD与EF所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882847505612800/2889839222472704/STEM/eb2d90f6036e4aea829317722b955274.png?resizew=234)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
(2)求证:EF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d67be899bc131ec1b9921ae9787c40d5.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4e4a162f12d12a082b8d8fdd1aeab9.png)
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解题方法
【推荐3】如图,空间几何体
中,四边形
是矩形,
平面
,平面
平面
.
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca0832e094d5c05ec13c38ae556b3f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c0566d4ccf791d639c7823398941d7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/8b5dbb96-cf99-430c-8c30-0ac8dea755d3.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7dac702fe64edf1bc265da4b98cf2a0.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7d63989923cff8efb6d67070be48794.png)
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