如图,在平行六面体
中,
,
,
,
(1)求
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cead0e8eadfdcefa334953e88864f424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7362be3007eef9e6cdcbdbdad769eab7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b448365344987329313d7489c756d738.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://img.xkw.com/dksih/QBM/2012/2/20/1570755401695232/1570755406807040/STEM/7086ca2ef0864288a92edfb40ba20846.png?resizew=324)
12-13高二上·浙江温州·期末 查看更多[1]
(已下线)2011-2012学年浙江省温州八校高二上学期期末联考理科数学试卷
更新时间:2016-12-01 15:32:58
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解答题-证明题
|
适中
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【推荐1】空间四边形OABC各边以及AC,BO的长都是1,点D,E分
别是边OA,BC的中点,连接DE
(1)求DE的长
(2)求证OA
BC
别是边OA,BC的中点,连接DE
(1)求DE的长
(2)求证OA
![](https://img.xkw.com/dksih/QBM/2011/12/6/1570557903421440/1570557908836352/STEM/46ec9c1030ff476bb6c55bd1da2c2804.png)
![](https://img.xkw.com/dksih/QBM/2011/12/6/1570557903421440/1570557908836352/STEM/64d7fece8da541c9a5d6f1632d284e6b.png)
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解题方法
【推荐2】已知二面角
为
,A,B是棱l上的两点,AC,BD分别在半平面
内,
,且
,设:
.
![](https://img.xkw.com/dksih/QBM/2022/10/21/3092288579117056/3093033655230464/STEM/5e9f75a3fedb47d98fb84bcb3919adba.png?resizew=179)
(1)试用
表示
,并求线段CD的长;
(2)求:异面直线CD与BA所夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae7ffcffdc546f921b1cab02d629ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7435836899f6cd9fd01d84568b02239e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775420da1988d2bcb0e05a2cfd385db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7036f26e08cb8354b9c2c9dcca872c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97661b6b212ecede3a0a26441e19d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672e0559698e2c92a22ab1930eaa0e3d.png)
![](https://img.xkw.com/dksih/QBM/2022/10/21/3092288579117056/3093033655230464/STEM/5e9f75a3fedb47d98fb84bcb3919adba.png?resizew=179)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e2b694fa1584587e4f1ba3bbc26eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a1a69d7460d12d4facd43e0d941190.png)
(2)求:异面直线CD与BA所夹角的余弦值.
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱锥
中,底面
是正方形,
是棱
的中点,设
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/d12cb80c-92dd-4835-91d6-86645ab28de3.png?resizew=170)
(1)试用
,
,
表示向量
;
(2)若
交平面
于
,用
,
,
表示向量
.
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3adc4ed291596abf3bb93ae7a075d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e984585ddf28c039219afcebf229de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64b61e5a723d742c5c49dc3c34856f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/d12cb80c-92dd-4835-91d6-86645ab28de3.png?resizew=170)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a046d7060dc843c78af806ee24f556.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c54d01623f09f23103f03ba1135fc6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64c5562bd4d1b54424330cb6329cd79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b45ba716f03748c19b7ce2f99af536ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a0b19e69be46452425916a0fcb49c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8962b0c33df0302e741501c1491bf643.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在四面体ABCD中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/c81fde35-f708-4b8a-b85f-7d0c54e88c5e.png?resizew=171)
(1)求
的值;
(2)已知F是线段CD中点,点E满足
,求线段EF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2163a2634041c4f809051f99035cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88c44f558705de3bcefcfc0ece96b8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e4f0c1c9cca0555906d8a53e1a6803d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/4/c81fde35-f708-4b8a-b85f-7d0c54e88c5e.png?resizew=171)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be919d72a83e0978c6411bb24902d6c7.png)
(2)已知F是线段CD中点,点E满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41dd2c64fc91c03e8cf5fb6b104790eb.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知正方形
和
边长都为2,且平面
平面
,
是
的中点,
是
的中点,
(1)求证:
平面
;
(2)求点
到平面
的距离;
(3)求证:
//平面
;
(4)求二面角
的平面角大小的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a406f24b5131eb7da9127750319e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a406f24b5131eb7da9127750319e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb92a5e7dc942c44d0f6d7f3906ff804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301925a3de5a772742909eed4109ec73.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/301925a3de5a772742909eed4109ec73.png)
(4)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335deb37356b3eabfdc74061f433c4b7.png)
![](https://img.xkw.com/dksih/QBM/2011/5/19/1570208650960896/1570208656334848/STEM/fafb8c7e82f44613a749576ed27f2adc.png?resizew=159)
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ABCD是直角梯形,侧棱
底面ABCD,AB垂直于AD和BC,SA=AB=BC=2,AD=1,M是棱SB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/3831c363-9ad3-44fc-a9d6-de6b04004202.png?resizew=163)
(1)求证:
平面SCD;
(2)求平面SCD与平面SAB所成锐二面角的余弦值;
(3)设点N是线段CD上的动点,MN与平面SAB所成的角为
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/3831c363-9ad3-44fc-a9d6-de6b04004202.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f33fa5152ba27f7b8a28890cefca219.png)
(2)求平面SCD与平面SAB所成锐二面角的余弦值;
(3)设点N是线段CD上的动点,MN与平面SAB所成的角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7d5ef3a3d9a03be91135fc426d57cc.png)
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