1. 直接写出得数。                  

5.5+5=              1.25×8=             9.6÷0.6=             9-3÷6=

0.8-0.08=           8÷0.16=             0.75÷5=             4÷0.2-4²=

2.列竖式计算。

98÷28                       9.09÷0.45=                     0.15÷0.9≈

                        （结果保留两位小数）

3.递等式计算。

8.4÷20÷0.5                                   (5.6-1.6÷2)×2.5

9.8+0.8÷(3.4-0.9)                               4.05×[51÷(1.5+0.2)]