21.4-40.5/705简算

问题描述:

21.4-40.5/705简算
21.4-40.5/705
0.85*99
7.5*0.45-0.45*6.5
能简算的简算
急用

21.4-40.5/705=
0.85*99=0.85*(100-1)=85-0.85=84.15
7.5*0.45-0.45*6.5=0.45*(7.5-6.5)=0.45