3m-1)(m+1)+(2m-1)(m-1)-(3m+5)(m-2)怎么计算?

分类: 作业答案 • 2021-12-28 14:51:31

问题描述：

答

(3m-1)(m+1)+(2m-1)(m-1)-(3m+5)(m-2)
=3m²+2m-1+2m²-3m+1-3m²+m+10
=2m²+10
=2(m²+5)