先化简,再求值.
,其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4312fc629cd1f38037b98f37f3553e84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602e42da07007c64498fc85433c68313.png)
更新时间:2020-02-18 15:57:10
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解答题-问答题
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较易
(0.85)
【推荐1】(1)已知(x+y+3)2+
=0,试求多项式x2+y2-x-3的值.
(2)已知多项式
,在
时,其值为8,试求
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(2)已知多项式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a38f36f4760ebdffb0561e93a0ba3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2600a54b7bf3f79aaec7d49a47f6b4d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d2b01f86fb5a373af6b089cf3d891b.png)
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