已知|x-y-3|+(2x+2y+10)²=0,则(x+y)(x-y)的值为

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2024-12-26 22:15:35
推荐回答(4个)
回答1:

已知|x-y-3|+(2x+2y+10)²=0
所以
已知|x-y-3|=0,(2x+2y+10)²=0
从而
x-y-3=0,2x+2y+10=0

x-y=3,x+y=-5
所以
(x+y)(x-y)=-5*3=-15

回答2:

∵|x-y-3|+(2x+2y+10)²=0
∴x-y-3=0;(1)
2x+2y+10=0;(2)
解得:x=-1.y=-4;
(x+y)(x-y)=x²-y²=1-16=-15;

回答3:

-5*3=-15

回答4:

*9*98*85