7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 07:28:01
7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
x)33=Z lmX#2#$efz5`Ty m&% $A=d<럀Cq`6pO`j'NL{1JX j`-0UӁd=*,1D tAN@&@+QQ ?APV*d B

7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?

7.5×2.3+1.9×2.5+1.25×0.4怎么简便计算?
7.5×2.3+1.9×2.5+1.25×0.4
=2.5×3×2.3+1.9×2.5+1.25×2×0.2
=2.5×6.9+1.9×2.5+2.5×0.2
=2.5×(6.9+1.9+0.2)
=2.5×9
=22.5

提2.5

2.5×3×2.3+2.5×1.9+2.5×0.5×0.4=2.5×(6.9+1.9+0.2)=2.5×9=22.5

化成=2.5*3*2.3+2.5*1.9+2.5*0.5*0.4
=2.5*(6.9+1.9+0.2)
=2.5*9
=2.5*10-2.5
=22.5

(10-2.5)x2.3+1.9x2.5+1.25x0.4=23-2.5x2.3+2.5x1.9+1.25x0.4=23-2.5x0.4+1.25x0.4=23-0.4x1.25