4a^2x-4a^2y-b^2x+b^y

问题描述:

4a^2x-4a^2y-b^2x+b^y
如题

4a^2x-4a^2y-b^2x+b^y
=4a^2(x-y)-b^2(x-y)
=(4a^2-b^2)(x-y)
=(2a+b)(2a-b)(x-y)