计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
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计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
(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)]
=x-y-x-y
=-2y
原式等于:(x-y)^7÷(x-y)^6 +(-x-y)^3÷(-x-y)^2
等于:x-y+(-x-y)
等于:-2y
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