1. 计算下面各题，能简算的请你简算。

（1）0.25×9.3×4                                 （2）0.83×53＋8.3×4.7

（3）5.4÷1.25÷8                                 （4）（2.1＋6.9÷0.15）÷0.2

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

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]