化简x平方+2x+1分之3x平方-9x-12
问题描述:
化简x平方+2x+1分之3x平方-9x-12
答
解
(3x²-9x-12)/(x²+2x+1)
=3(x²-3x-4)/(x+1)²
=3(x-4)(x+1)/(x+1)²
=3(x-4)/(x+1)