求下列各式的值.
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238998736f3e342fa98c7bb75b4d4f94.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8aeffec2ad59c487ee7aa6b6b25d53.png)
更新时间:2020-12-25 22:21:47
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较易
(0.85)
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(2)已知x+y=12, xy=9,且x<y,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/577ed0748e1a07bb8a10532f4a9e4fb5.png)
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