计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2
1个回答
(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
=(x-y)^7÷(x-y)^6-(x+y)^3÷(x+y)^2
=(x-y)-(x+y)
=-2y
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