题目内容
| 计算。(能简算的要简算) | ||||
|
| (1)2 .58 ×1 .9 =2.58×(2-0.1) =2.58×2-2.58×0.1 =5.16-0.258 =4.902 |
(2)10 .8 ÷1 .2 =10.8÷(0.2×6) =10.8÷0.2÷6 =54÷6 =9 |
| (3)4 .5 ÷0 .5 ÷9 =4.5÷(0.5×9) =4.5÷4.5 =1 |
(4)0 .32 ×1 .25 ×0 .25 =(0.4×0.8)×1.25×0.25 =(0.8×1.25)×(0.4×0.25) =1×0.1 =0.1 |
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