(x-y)^7除以(y-x)^3除以(y-x)^2=_____
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(x-y)^7除以(y-x)^3除以(y-x)^2=_____(x-y)^7除以(y-x)^3除以(y-x)^2=_____(x-y)^7除以(y-x)^3除以(y-x)^2=_____-(x-y)^
(x-y)^7除以(y-x)^3除以(y-x)^2=_____
(x-y)^7除以(y-x)^3除以(y-x)^2=_____
(x-y)^7除以(y-x)^3除以(y-x)^2=_____
-(x-y)^2 (x-y)^7÷(y-x)^3 = (x-y)^7÷[-(x-y)^3] =-(x-y)^4 -(x-y)^4÷(y-x)^2=-(x-y)^4÷(x-y)^2=-(x-y)^2
(x-y)^7除以(y-x)^3除以(y-x)^2 =(x-y)^7除以-(x-y)^3除以(x-y)^2 =-(x-y)^4除以(x-y)^2 =-(x-y)^2
(x-y)^7除以(y-x)^3除以(y-x)^2=_____
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