已知|x-2y|+(2x-y-3)²=0求(x+y)²与(x-y)²的值
2个回答
∵|x-2y|+(2x-y-3)²=0
∴x-2y=0 2x-y-3=0
∴x=2 ,y=1
(x+y)²=(2+1)²=9
(x-y)²=(2-1)²=1
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