化简x平方+2x+1分之3x平方-9x-12

分类: 作业答案 • 2021-12-18 22:42:03

问题描述：

答

原式=3(x^2-3x-4)/(x+1)^2=3(x-4)(x+1)/(x+1)^2=3(x-4)/(x+1)

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)