1 . a,b,c为实数,在等式中,若
,则
;在不等式中,若
,则
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c2c12e403e4dab34c0590455dc0ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13c960fa57440fcabc5b2cc086ccc64.png)
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2 . 命题:①若
,则
;②若
,则
;③若
,则
;中正确的命题是②③.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98fb7a22350d03bd418beb1744dbfc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
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3 . 若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b9d08cf536bbb76bce1b0f135772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
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4 .
的解集为
. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c8c601adb941956c91286381f9f8e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e7510eff1b04b2150bec32c1a5a410.png)
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5 .
的解集为
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/537bdbd11f06ba2f05ac32ea278946fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e88ebfb5c0d6cce558b515be06404d.png)
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6 . 已知
,若
,则
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4262f7e1cd76dcfe1c72b886fce81be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/581bf386f6a79959e92e22309f6cb0b7.png)
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