4+9(x-y)²+12(x-y)

分类: 作业答案 • 2022-03-18 20:08:25

问题描述：

4+9(x-y)²+12(x-y)

答

4+9(x-y)²+12(x-y)
=9(x-y)²+12(x-y)+4
=[3(x-y)+2]²
=(3x-3y+2)²