因式分解:x^2+xy-2y^2+2x+7y-3
问题描述:
因式分解:x^2+xy-2y^2+2x+7y-3
答
x^2+xy-2y^2+2x+7y-3
=x²+(2+y)x-(2y²-7y+3)
=x²+(2+y)x-(2y-1)(y-3)
=(x+2y-1)(x-y+3)