如图,PDCE为矩形,ABCD为梯形,平面PDCE⊥平面ABCD,∠BAD=∠ADC=90°,AB=AD=
CD=1,PD=
.
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571816802746368/1571816808677376/STEM/ff8eaccef82a491a9655c177f2410bbd.png)
(1)若M为PA中点,求证:AC∥平面MDE;
(2)求直线PA与平面PBC所成角的正弦值;
(3)在线段PC上是否存在一点Q(除去端点),使得平面QAD与平面PBC所成锐二面角的大小为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571816802746368/1571816808677376/STEM/ff8eaccef82a491a9655c177f2410bbd.png)
(1)若M为PA中点,求证:AC∥平面MDE;
(2)求直线PA与平面PBC所成角的正弦值;
(3)在线段PC上是否存在一点Q(除去端点),使得平面QAD与平面PBC所成锐二面角的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdab625e32e38d1c72c901cece0e147.png)
2013·安徽·一模 查看更多[2]
更新时间:2016-12-03 03:32:23
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】如图,在四棱柱
中,侧棱
底面
,四边形
为菱形,
,E,F分别为
的中点.
平面
,并求点C到平面
的距离;
(2)证明:
四点共面.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e77db8e97cf0910fec52f526d0e4b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e86e3991200297ad172455e5ea93f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc78a86b12ba0b4553135a3a635fc418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc78a86b12ba0b4553135a3a635fc418.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da066c1fd31a8271a7c2c73d089a27d.png)
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解答题-问答题
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【推荐2】如图,三棱柱
中,
平面
,
,
是棱
的中点,
.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/3eac007c7c2341f983675ad1f8fb06b3.png)
(1)证明:
;
(2)设
,
的中点为
,求点
到平面
的距离.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/6abd7cfc6b6046d893e3e8fb3e7896d3.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/ab581c4b8d4541bab1f2de5f3dd8316d.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/4a5ced8cd5e34789ae570eeac7e1c3d1.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/7abf7fb9f09d482eb7b701f43e5d5b66.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/29cdece757b64f27b32e9052201c60c9.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/da7e61a5d8ac4698aec6e7fa9a7536fe.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/6d76d786a2a24d85be5acfafafea59bb.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/3eac007c7c2341f983675ad1f8fb06b3.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/f4d027f4aadc4a479068148a96ee4eb6.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/ee0ea0770d2c4b828941ac2cb879eb1b.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/12c63870f4774be3b4c5eb065bfad062.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/814dfa17f4274df293ea236a2651fc7c.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/814dfa17f4274df293ea236a2651fc7c.png)
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572503850123264/1572503856078848/STEM/7348dcb74ded4b40b1b338eccc293299.png)
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【推荐1】已知某几何体的直观图和三视图如下图所示,其正视图为矩形,侧视图为等腰直角三角形,俯视图为直角梯形.
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571956048723968/1571956054056960/STEM/4cc0a0d541c540e39f880c8e8b2e9854.png)
(1)证明:BN⊥平面C1B1N;
(2)求点
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571956048723968/1571956054056960/STEM/4cc0a0d541c540e39f880c8e8b2e9854.png)
(1)证明:BN⊥平面C1B1N;
(2)求点
![](https://img.xkw.com/dksih/QBM/2015/1/7/1571956048723968/1571956054056960/STEM/cd868351ee1b4381958c5188b6298d55.png)
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名校
【推荐2】如图,长方体
中,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2017/5/9/1683233597046784/1684162260983808/STEM/0c9681c5f89d4e54b31f161c79097d9e.png?resizew=250)
(1)证明:
平面
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643c1d8cdf1415e1e4714463f5cc88c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2017/5/9/1683233597046784/1684162260983808/STEM/0c9681c5f89d4e54b31f161c79097d9e.png?resizew=250)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11f1840eb8b17e7b07c3fe7e987a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fa81c1f81266b4ef3d471bc6bfc38d.png)
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