若
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
,则“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3950da8cd77184269cb416959a33aad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa3205b1df826d63914dcb55bb3ab43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc597b4887651e79f55670147a8d36b.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
更新时间:2021-11-21 10:08:51
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【推荐1】现有如下命题:
命题
“
”的否定为“
”;
命题
中,
分别为角
的对边,则“
”是“
”的充要条件.
则下列命题中的真命题是( )
命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267314a26ea47cceba9bae3ded2f608a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/511e879e408eecea880616c0464281ab.png)
命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3580b1272ffc6fef309cfa6f3abc6f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f5573b30734d65648f61c0a94c98de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2240a87f7a508cef8df7a45801ca7f5a.png)
则下列命题中的真命题是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
【推荐2】若
,则“
”是复数“
为纯虚数”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81937f6e6c33702236e7a91eb771c8e.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
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【推荐1】已知函数
在
上是减函数,则
的取值范围( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8619323792b0d47a4042cd237cc9987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bdff6c5115989681766adc33aaed62b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知
,若函数
的图象关于
对称,且函数
在
上单调,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674f866fb89ea7d56186ea6ff87a8a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3038a4b8c02b12b821fbd0fd69145900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61dff5b63913762b3be82e55a18f3847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
A.4 | B.3 | C.2 | D.1 |
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