在四棱锥
中,四边形ABCD是边长2的菱形,△PAB和△PBC都是正三角形,且平面PBC⊥平面PAB.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/8571a6e6-9efb-4e42-b503-924450605a22.png?resizew=162)
(1)求证:AC⊥PD;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/8571a6e6-9efb-4e42-b503-924450605a22.png?resizew=162)
(1)求证:AC⊥PD;
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
更新时间:2023-01-13 23:32:53
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在三棱锥
中,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933409715191808/2935357940195328/STEM/333636ebf48c4c82a32570823a1adacc.png?resizew=158)
(1)求三棱锥
的体积;
(2)求异面直线AC与BD所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://img.xkw.com/dksih/QBM/2022/3/10/2933409715191808/2935357940195328/STEM/333636ebf48c4c82a32570823a1adacc.png?resizew=158)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
(2)求异面直线AC与BD所成角的余弦值.
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解答题-证明题
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适中
(0.65)
【推荐2】如图,四棱锥
中,底面
是边长为2的正方形,侧面
底面
,
为
上的点,且
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/6454337e-09dc-40d5-a47f-6b088887be41.png?resizew=92)
(1)求证:平面
平面
;
(2)求三棱锥
体积的最大值;
![](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/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/6454337e-09dc-40d5-a47f-6b088887be41.png?resizew=92)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在底面是正方形的四棱柱
中,
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/b8ccd877-91b0-49ef-811c-fdd6083f75f0.png?resizew=109)
(1)证明:四棱柱
为正四棱柱.
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911771de9f5bbe1b630d8383334b127c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c099ab2b6751055a79be834ca178a4a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/b8ccd877-91b0-49ef-811c-fdd6083f75f0.png?resizew=109)
(1)证明:四棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a22b327c4892f19b73ec309dd220b225.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,在三棱锥
中,
平面ABC,
,F是PC上一点.
,求证:平面
平面PBC;
(2)若E是PA的中点,F是PC的中点,
,二面角
的大小为
,求直线BE与平面ABF所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/832f51e49422388ae22e8bf5b17b5448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf84ed033bd035c2fe7552badd5e447d.png)
(2)若E是PA的中点,F是PC的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f14fe22376f70a50752d3e146b8e1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864689852707154e3a9be79f657f16d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,已知正方形ABCD的边长为2,分别取BC,CD的中点E,F,连接AE,EF,AF,以AE,EF,FA为折痕进行折叠,使点B,C,D重合于一点P.
![](https://img.xkw.com/dksih/QBM/2022/2/17/2918488916508672/2935258235191296/STEM/2cec91ab-60bc-41eb-a0f0-b75929054972.png?resizew=367)
(1)求证:
;
(2)求三棱锥
的体积
![](https://img.xkw.com/dksih/QBM/2022/2/17/2918488916508672/2935258235191296/STEM/2cec91ab-60bc-41eb-a0f0-b75929054972.png?resizew=367)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461b5b33f1bee2cee89b70a53bed6f04.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b115316e0fcd2ef46a4dd383472996e4.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】如图,已知等腰梯形
中,
,
为
的中点,
为
与
的交点,将
沿
向上翻折成
,使平面
平面
.
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572702862000128/1572702868332544/STEM/b782969e144a4923a531fccc90a93a56.png?resizew=159)
(1)求证:
;
(2)若
为
的中点,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87447b0467681a7b43623f0d3ab0ab52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f955e5cc9f108de6f3ca01e5eb84c52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72b886208c6c2df19b984f2631e1c996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce7f8d07d7289b79b6e4bf3545dd2b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69eab2828488f68c5992385e8d0e8717.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572702862000128/1572702868332544/STEM/b782969e144a4923a531fccc90a93a56.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f405ee31b17b3cdccee05fd06f6562.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752dc3cc77f0d0ec4a1d0981970410a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab5f236e0c248607721ff77b6ea8b6ee.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在矩形
中,
是
的中点,以
为折痕将
向上折起,使
为
,且平面
平面
.
![](https://img.xkw.com/dksih/QBM/2021/9/15/2808544331800576/2809189649989632/STEM/7d2d2eb9f37b4aa5aaec141971b7d71d.png?resizew=450)
(Ⅰ)求证:
;
(Ⅱ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aff1f918c93a963e2db51d99eb1d75c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e782c11b1fdb43c1e9b0175ff6ce47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70fd4f68511d2393905617bfdeddddec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ff27eea7545bb06f9472f91290c54e.png)
![](https://img.xkw.com/dksih/QBM/2021/9/15/2808544331800576/2809189649989632/STEM/7d2d2eb9f37b4aa5aaec141971b7d71d.png?resizew=450)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e09a917d0d0d980d47bb3f399a010e1.png)
(Ⅱ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae9bd3db15b3c5062240b4438fe6476.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
解题方法
【推荐2】如图,在四棱锥
中,底面
是正方形,平面
底面
,侧棱
与底面所成的角为
.
(1)证明:平面
平面
;
(2)若平面
平面
,求二面角
的正弦值.
![](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/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/cc455b2f-c1c2-4d27-a6f8-9418a877d104.png?resizew=141)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1069d514c3c32aeabd274475ee209ed6.png)
您最近一年使用:0次