已知x>y,那么下列各式一定正确的个数是( )
①x+9>y+9;②-3x< -3y;③
<
;④3x-5<3y-5
①x+9>y+9;②-3x< -3y;③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af97cd591ecc739ea13c8eda907b19de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad15b0dcc548769c75e4a3a45a6915a9.png)
A.1个 | B.2个 | C.3个 | D.4个 |
更新时间:2022-09-06 17:20:55
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