如图所示,在三棱柱ABC—A1B1C1中,四边形AA1B1B为矩形,平面AA1B1B⊥平面ABC,点E,F分别是侧面AA1B1B,BB1C1C对角线的交点.
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733107331579904/2782527988998144/STEM/746f54aebc6b4edf82e873c29fce4f64.png?resizew=146)
(1)求证:EF∥平面ABC;
(2)证明:平面B B1C⊥平面ABC.
![](https://img.xkw.com/dksih/QBM/2021/5/31/2733107331579904/2782527988998144/STEM/746f54aebc6b4edf82e873c29fce4f64.png?resizew=146)
(1)求证:EF∥平面ABC;
(2)证明:平面B B1C⊥平面ABC.
更新时间:2021-08-09 16:50:35
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【推荐1】如图,在四棱锥
中,
平面
,底面
为直角梯形,
,
,
.
为棱
的中点,证明:
平面
.
(2)求平面
与平面
的夹角的大小.
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(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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【推荐2】如图,在三棱柱
中,四边形
是菱形,四边形
是正方形,
,
,
,点
为
的中点.
(1)求证:
平面
;
(2)求四面体
的体积.
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9d32e76582bf550593fdef53e081225.png)
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(2)求四面体
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【推荐1】如图,在正方体
中,求证:平面
平面
.
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【推荐2】如图,圆柱
内有一个三棱柱
,三棱柱的底面为圆柱底面的内接三角形,且
是圆O的直径,
.
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(1)证明:平面
平面
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(2)设E,F分别为
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),问当x为何值时,三棱锥
的体积最大?并求出最大值.
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(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df00cdf77ed39ca5a0b305861a693142.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9961e091f180e964a962adf6916f33c8.png)
(2)设E,F分别为
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【推荐1】如图,在四棱锥
中,底面
为平行四边形,
为等边三角形,平面
平面
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,
,
.
、
分别为
,
的中点,求证:
平面
;
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平面
;
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与平面
所成角的余弦值.
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(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
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(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐2】如图,四棱锥
中,
,
,
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平面
.证明:
;
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【推荐3】如图,在四棱锥P﹣ABCD中,四边形ABCD是等腰梯形,∠ABC=60°,AB∥CD,CB=CD=1.点E为棱PC的中点,点F为棱AB上的一点,且AB=4AF,平面PBC⊥平面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/ce17eca5-a5cd-4e56-bc01-f0c36b46b90d.png?resizew=169)
(1)证明:AC⊥PB;
(2)证明:EF∥平面PAD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/27/ce17eca5-a5cd-4e56-bc01-f0c36b46b90d.png?resizew=169)
(1)证明:AC⊥PB;
(2)证明:EF∥平面PAD.
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