(x-y)7次方÷(y-x)3次方*(y-x)2次方
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(x-y)7次方÷(y-x)3次方*(y-x)2次方
= (x-y)^7 ÷ (y-x)^3 * (y-x)^2
= (x-y)^7 ÷ (-1)*(x-y)^3 * (x-y)^2
= (-1)*(x-y)^4 * (x-y)^2
= (-1)*(x-y)^6
= - (x-y)^6
= (x-y)^7 ÷ (y-x)^3 * (y-x)^2
= (x-y)^7 ÷ (-1)*(x-y)^3 * (x-y)^2
= (-1)*(x-y)^4 * (x-y)^2
= (-1)*(x-y)^6
= - (x-y)^6
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