下列命题中是假命题的是
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2016-12-04 06:55:27
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【推荐1】下列命题中的假命题是( )
A.![]() ![]() |
B.存在四边相等的四边形不是正方形 |
C.“存在实数![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() |
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【推荐2】下列命题中真命题的个数为( )
(1)
,方程
有解;
(2)
,
,都有
;
(3)至少有一个菱形不是正方形;
(4)
是无理数
,
是无理数.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1485a4756c56f1126b9825d5019d544c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cdd6f27334444c1884876b9e4cfe6f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54dad48527a47eab4a5916ab0421cc71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b437c89937a7cd619fa4498ae32e46b9.png)
(3)至少有一个菱形不是正方形;
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7054cd6e69bddf354fa2e16473e2f191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ca8bdc812627d925f00ed7c145d696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
A.1 | B.2 | C.3 | D.4 |
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解题方法
【推荐2】已知命题
:
,
;命题
:
,
,则下列命题中为真命题的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99af354040b6409d75cebc6de0c7d455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50087575e0b897f50d59b1e65a6cdec8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02491f9709f00a1bc169278fbe01f576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/052be1bc2096ed8583020e0988346c70.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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