Question

计算题 :(x-y)的3次方乘以(y-x)的4次方除以(y-x)的3次方除以(x-y)

Answer 1

原式=(x-y)^3*(y-x)^4/(y-x)^3/(x-y)
=(x-y)^7/(x-y)^3/(x-y)
=(x-y)^4/(x-y)
=(x-y)^3