名校
1 . 下列四个命题,其中真命题的个数是( )
(1)若
,则
或
;
(2)若
,则
;
(3)已知a,b是实数,若
,则
;
(4)已知a是实数,不等式
的解是
;
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ad78dc8b8aed907b4fe9640c997454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a70d32c64918aa4d1d9d3ce0bdbf7b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b83a660527359758db64e6566466293.png)
(3)已知a,b是实数,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5f0d374837655cc286d326305da36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e25e52343ede4373bc599876cce2fb.png)
(4)已知a是实数,不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73e3e3121bb9b2bd601bb8f8701c5b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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