在直角梯形ABCD中,
,
(如图1),把△ABD沿BD翻折,使得
平面BCD,连接AC,M,N分别是BD和BC中点(如图2).
平面AMN;
(2)记二面角A—BC—D的平面角为θ,当平面BCD⊥平面ABD时,求tanθ的值;
(3)若P、Q分别为线段AB与DN上一点,使得
(如图3),令PQ与BD和AN所成的角分别为
和
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d660e4c409a468277c7892bb44f0aaa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77745febf133c1922bffdb8b2a427b0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c309e58bf083bad13abd549720a63a22.png)
(2)记二面角A—BC—D的平面角为θ,当平面BCD⊥平面ABD时,求tanθ的值;
(3)若P、Q分别为线段AB与DN上一点,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84fea3a02f5849a42fa0317b5091563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f64fa38725c136504f723019a18dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93fa313adc4ac7608ba9449fd755212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d42cd1f65b49da85d8563e1dca540d4.png)
更新时间:2024-05-12 09:39:32
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,
,
为异面直线,且
,
,
,
是
上两点,
,
是
上两点,
,
,
,
分别交
于点
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/aeadbafd-9aa5-4ea0-a624-626a727456f3.png?resizew=158)
(1)求证:四边形
为平行四边形;
(2)若
,
,
,
与
所成角为
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4d6a7aec04e1d5768ef830b534460a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b330d69a949d9b55f4b6f18f47e0a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/aeadbafd-9aa5-4ea0-a624-626a727456f3.png?resizew=158)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8896d36ad57579470ca8301ccb12636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad3fd1b54bf975d0e97990247aab714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
您最近一年使用:0次
解答题
|
适中
(0.65)
名校
【推荐2】如图,在四棱锥P-ABCD中,PA⊥平面ABCD,AB⊥AD,AD∥BC,AP=AB=AD=1.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/106d7042-0028-491a-bf3c-30d3b48b914a.png?resizew=198)
(1)若直线PB与CD所成角的大小为
求BC的长;
(2)求二面角B-PD-A的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/106d7042-0028-491a-bf3c-30d3b48b914a.png?resizew=198)
(1)若直线PB与CD所成角的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
(2)求二面角B-PD-A的余弦值.
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解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱锥P-ABCD中,侧面PAD⊥底面ABCD,底面ABCD为直角梯形,其中AB∥CD,∠CDA=90°,CD=2AB=2,AD=3,
,
,点E在棱AD上且AE=1,点F为棱PD的中点.
![](https://img.xkw.com/dksih/QBM/2021/11/14/2850967373897728/2857631654313984/STEM/b05bbd7b-cc40-40cf-a0a4-04e841d6075c.png?resizew=317)
(1)证明∶平面BEF⊥平面PEC;
(2)求二面角A-BF-C的余弦值的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ad66112b09c909cab417085702ec00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6281306726065e7075c579b9b66537.png)
![](https://img.xkw.com/dksih/QBM/2021/11/14/2850967373897728/2857631654313984/STEM/b05bbd7b-cc40-40cf-a0a4-04e841d6075c.png?resizew=317)
(1)证明∶平面BEF⊥平面PEC;
(2)求二面角A-BF-C的余弦值的大小.
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,在四棱锥
中,平面
平面
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2018/3/29/1912173623697408/1912845135642624/STEM/88ff6adef19643bb9d1770e88ae24dca.png?resizew=195)
(
)求证:
.
(
)求证:平面
平面
.
(
)在平面
内是否存在
,使得直线
平面
,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cbb05b8b630052ff544249ebd72d95d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3384e2b63e4be03a8762b819499e669b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2018/3/29/1912173623697408/1912845135642624/STEM/88ff6adef19643bb9d1770e88ae24dca.png?resizew=195)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b44f4120c94cb7176dc31fcac387b32e.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04c222223dae9ef27d4c132534d9848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77cced58072f2508af8f2b7f7c0b4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在等腰三角形
中,
,
,
为线段
的中点,
为线段
上一点,且
,沿直线
将
翻折至
,使
,记二面角
的平面角为
.
(1)证明:平面
平面
;
(2)比较
与
的大小,并证明你的结论;
(3)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284a563413dc0532138fb2a64db8cc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ab0389bef7fea9fd2429966ef6bf2d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbced129627233661d88e9663a9e13c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a09c96544cb7a506eed0d1a0fe4b373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555dfe77eeb168a880694e22bd9acbdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696ae55a4efddffcd268d19eb6394f66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/3c3c4f66-527f-439d-964c-aedf89b0297a.png?resizew=520)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f712354433767f5b7e439eab380d6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329dcf9ed68b63076236908529c98ea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在四棱锥
中,平面
平面
,
,
,
,
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/8/19/3047950673870848/3048161026072576/STEM/2c5311e3f95b4e0fa103243cd064f236.png?resizew=167)
(1)求证:
平面
;
(2)求平面
与平面
夹角的正弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c753cb1eb73fd8d136d00462970797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c30f6595dd643813b11ad71df61a10dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0295d3385f3ec11ad4d77d39d2e68ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bed3e10975653a8322f9b3e6abc1df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2022/8/19/3047950673870848/3048161026072576/STEM/2c5311e3f95b4e0fa103243cd064f236.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa14afe6f0aad22e8e869c39a60be657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4739afd7311501e948aa4e1e5c1cb17.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(1),在等腰梯形
中,
是梯形的高,
,
,现将梯形沿
,
折起,使
且
,得一简单组合体
,图(2)示,已知
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2016/8/19/1572986405191680/1572986410819584/STEM/d69395c8392244cea737b0feb6ae77ee.png?resizew=554)
(1)求证:
平面
;
(2)若直线
与平面
所成角的正切值为
,求平面
与平面
所成的锐二面角大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fcbff686fbbe3f58183139941c67ac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc2cb75b53fea2d000c4e29a65b8301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080ca48cd27d4bf9d9ef084b558fc17a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27ba2124e1ac54a1ac1a684b72718676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9366db1b71034abbe1a5693689cf1c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2016/8/19/1572986405191680/1572986410819584/STEM/d69395c8392244cea737b0feb6ae77ee.png?resizew=554)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b21d6acf25a84a7f32cc5c70c60ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.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,在多面体
中,已知
,
,
,平面
平面
,四边形
是正方形.
![](https://img.xkw.com/dksih/QBM/2022/11/17/3111590721298432/3112302315495424/STEM/1782cf070c5e4ae98c54ec2ba7b0d85e.png?resizew=185)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f2185273bf04c11118c7954f7ec822.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657d5471e57b894c3833bb3f43ff38ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a1ce226f636a38dcb980164d69e46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a41e1be0d39b6666edcf4f2d5fe7729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653ddc9c58281c1cc096de7c15ed0749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bc51695e51aa8cd2f97d220c8f5340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bc51695e51aa8cd2f97d220c8f5340.png)
![](https://img.xkw.com/dksih/QBM/2022/11/17/3111590721298432/3112302315495424/STEM/1782cf070c5e4ae98c54ec2ba7b0d85e.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735f54742d82c3d9340220466e77ccae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bc51695e51aa8cd2f97d220c8f5340.png)
(2)求点
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