题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-61291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-44632.png)
①若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-19816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-17284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-66454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-26219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024414-58747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024414-63284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024414-73463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024414-40845.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024414-22164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024414-88599.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024415-24920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-19816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024415-68156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024415-60427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024415-88625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024415-63856.png)
其中为假命题的是( )
A.① | B.② | C.④ | D.③ |
答案
解析
试题分析:对于命题①,假设
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024415-90095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-37958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-19927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-50857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-63101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-50857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-63101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-74740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-39767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-85532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-86145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-19787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-37958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024414-58747.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-50857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-51727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-75521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-71078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-86359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-51727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024417-71078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024418-85338.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024418-78363.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024418-52814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024418-57278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024418-10936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024418-69033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024416-39767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-19816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024418-16026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-26219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024419-64220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-71940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024413-32573.png)
核心考点
试题【给出下列关于互不相同的直线和平面的四个命题:①若,,点,则与不共面;②若、是异面直线,,,且,,则;③若,则;④若,,,,,则.其中为假命题的是( )A.①】;主要考察你对向量与空间位置关系等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024345-96546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024346-57030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024346-39353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024346-90470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024347-98906.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024347-38904.png)
(2)在棱上是否存在一点
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024347-58469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024348-16019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024348-41068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024348-30557.png)
(3)若二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024348-17569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024348-59546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024349-86979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024334-10180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024334-32009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024334-21178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024334-58679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024334-32009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024334-79055.png)
A.线段![]() |
B.线段![]() |
C.![]() ![]() |
D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024322-88765.jpg)
(I) 试判断直线CD与平面PAD是否垂直,并简述理由;
(II)求证:平面PAB⊥平面ABCD;
(III)如果CD=AD+BC,二面角P-CB-A等于600,求二面角P-CD-A的大小.
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024311-67376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024311-44820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024311-37098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024311-16990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024312-52937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024312-67022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024312-23938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024312-85628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024313-58451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024313-23253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024313-65914.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024313-73601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024314-91583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024314-85577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024255-15805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024255-88023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024255-32068.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024255-88023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024255-25817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024256-94503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024256-51996.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024256-35815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024256-78084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024257-48093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024257-45261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024257-17297.png)
(Ⅰ)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024257-32118.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024258-16334.png)
(Ⅱ)设二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024258-61395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024258-68426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024258-87397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024259-24406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024259-10828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106024259-54132.png)
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