(3x+1)^2(3x-1)^2(x-2y)(x+2y)-(x+2y)^2-36a^2+12ab-b^2(2m-3n)^2-2m+3n(x+2y)(x-2y)-(2x-y)(-2x-y)
(2a+b)^2-(3a-b)^2+5a(a-b)
(3x+1)^2(3x-1)^2(x-2y)(x+2y)-(x+2y)^2-36a^2+12ab-b^2(2m-3n)^2-2m+3n(x+2y)(x-2y)-(2x-y)(-2x-y)(2a+b)^2-(3a-b)^2+5a(a-b)要过程