3x²+xy-2y²因式分解

问题描述:

3x²+xy-2y²因式分解

3x²+xy-2y²
=x²+xy+2x²-2y²
=x(x+y)+2(x+y)(x-y)
=(x+y)(x+2x-2y)
=(x+y)(3x-2y)