已知|x+2y+5|+(X-Y-1)^2=0求(X+Y)^2的值
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已知|x+2y+5|+(X-Y-1)^2=0求(X+Y)^2的值
已知|x+2y+5|+(X-Y-1)^2=0求(X+Y)^2的值
已知|x+2y+5|+(X-Y-1)^2=0求(X+Y)^2的值
答:
|x+2y+5|+(X-Y-1)^2=0
绝对值和平方数都是非负数
所以:
x+2y+5=0
x-y-1=0
解得:
y=-2,x=-1
所以:
(x+y)^2=(-1-2)^2=9
绝对值+一个数的平方=0,说明绝对值和(x-y-1)都等于0,所以九十解答方程组,求出x和y的值,答案就出来啦