Question

简便运算，能简便运算的要简算。

1. 7.8÷2.5÷4
2. 640÷0.4÷0.2
3. 8.3×9.9+0.83
4. 8.18+2.6×3.2
5. 0.78×15÷0.3
6. 0.18÷0.24÷0.02
现在简便运算吧，不行的话说不能。

Answer 1

7.8÷2.5÷4
=7.8÷（2.5×4）
=7.8÷10
=0.78

640÷0.4÷0.2
=640÷0.08
=8000

8.3×9.9+0.83
=8.3×9.9+8.3×0.1
=8.3×10
=83

8.18+2.6×3.2
=8.18+8.32
=16.5

0.78×15÷0.3
=0.78×50
=39

0.18÷0.24÷0.02
=0.18÷0.02÷0.24
=9÷0.24
=37.5（或37又2分之1）

追问

还有一道0.18÷0.24÷0.025和8.48+2.6×3.2

追答

0.18÷0.24÷0.025

=0.18÷（0.24×0.025）
=0.18÷（0.6×0.4×0.025）
=0.18÷（0.6×0.01）
=0.18÷0.006
=30

追问

8.48+2.6×3.2