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


(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)