2个因式分解题：2xy-x^2-y^2 和 x^2m+1-4x^m+1+4x

分类: 作业答案 • 2022-03-22 11:04:12

问题描述：

答

2xy-x^2-y^2
=-[x^2-2xy+y^2]
=-[x-y]^2
x^2m+1-4x^m+1+4x
=x^2m*x-4x^m*x+4x
=x[x^2m-4x^m+4]
=x[x^m-2]^2