化简x^2-y^2+2y-1

分类: 作业答案 • 2022-05-02 21:38:37

问题描述：

化简x^2-y^2+2y-1

答

x^2-y^2+2y-1
=x^2-(y^2-2y+1)
=x^2-(y-1)^2
=[x+(y-1)][x-(y-1)]
=(x+y-1)(x-y+1)