X^2+4X-XY-2Y+4因式分解

问题描述:

X^2+4X-XY-2Y+4因式分解

x²+4x-xy-2y+4
=(x²+4x+4)-(xy+2y)
=(x+2)²-y(x+2)
=(x+2)[(x+2)-y]
=(x+2)(x-y+2)