2.5x(40十4十0.4)简便计算?
问题描述:
2.5x(40十4十0.4)简便计算?
答
2.5x40+2.5x4+2.5x0.4=111
答
25X40+4xo.4
答
=2.5x40+2.5x4+2.5x0.4=100+10+1=111
答
(2.5x40)+(4+0.4)=100+4.4 =104.4