xxx+2xy+yy-4x-4y-12的因式分解是多少开头是xx+2xy

问题描述:

xxx+2xy+yy-4x-4y-12的因式分解是多少
开头是xx+2xy

答:
xx+2xy+yy-4x-4y-12
=x²+2xy+y²-4x-4y-12
=(x+y)²-4(x+y)-6*2
=(x+y-6)(x+y+2)