Question

a的2次方乘(x-y)的3次方-b乘(y-x)的2次方因式分解怎么做.

Answer 1

a的2次方乘(x-y)的3次方-b乘(y-x)的2次方

=a^2(x-y)^3-b^2(x-y)^2

=(x-y)^2(a^2(x-y)-b^2)