3m-1)(m+1)+(2m-1)(m-1)-(3m+5)(m-2)怎么计算?
问题描述：
3m-1)(m+1)+(2m-1)(m-1)-(3m+5)(m-2)怎么计算?
答
原式＝3m²＋2m－1＋2m²－3m＋1－3m²＋m＋10
＝2m²＋10
答
=3m^2+2m-1+2m^2-3m+1-3m^2+m+10
=2m^2+10
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)