1. 递等式计算，能简便的要简便计算。

3.6÷2.5÷0.4             0.18÷0.6+0.85

5.4×62+62×4.6       12.8÷[(19.8-16.6)÷1.6]

4.6÷（1.6×12.5）                                                         2.33×3.4＋2.33×6.6

23.7÷2.5÷0.4                                                            （14.8－4.8÷2.5）×1.5

7.5÷(1.5+7.5×0.6)     1.9-1.9×0.9

12.5×20.24×8                    8.8÷（3.2+0.3×4）

0.63×38+62×0.63               5.4÷0.4÷2.5