Question

(x-y)7次方÷(y-x)3次方*(y-x)2次方

Answer 1

(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