x2-9y2+2x-6y因式分解
问题描述:
x2-9y2+2x-6y因式分解
.急
答
x2-9y2+2x-6y
=(x-3y)(x+3y)+2(x-3y)
=(x-3y)(x+3y+2)
4x^3-xy^2
=x(4x^2-y^2)
=x(2x+y)(2x-y)