题目内容
| 3.56+4.4= | 90.02-20.09= |
| 0.24×50= | 60÷0.6= |
| 0.8-0.8÷2= | 7.8×0.8÷3.9= |
| 46.8×2.04≈（用四舍五入法将计算结果凑整到百分位） | 14.3÷6.9≈（用四舍五入法将计算结果精确到0.1） |
分析：根据小数加减乘除的计算方法进行计算即可．
解答：解：
| 3.56+4.4=7.96， | 90.02-20.09=69.93， |
| 0.24×50=12， | 60÷0.6=100， |
| 0.8-0.8÷2=0.4， | 7.8×0.8÷3.9=1.6， |
| 46.8×2.04≈95.47， | 14.3÷6.9≈2.1． |
点评：口算时，注意运算符号和数据，然后再进一步计算即可．
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| 3.56+4.4= | 90.02-20.09= |
| 0.24×50= | 60÷0.6= |
| 0.8-0.8÷2= | 7.8×0.8÷3.9= |
| 46.8×2.04≈（用四舍五入法将计算结果凑整到百分位） | 14.3÷6.9≈（用四舍五入法将计算结果精确到0.1） |
| 180÷60= | 12×25= | 0÷90= |
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| 59亿-58亿= | （1.3+3.5）÷0.6= | 75÷2.5= |
| 0.45÷1.25÷8= | 2.5×7.6×4= | 97.6÷0.02= |
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| 7.2+2.8= | 0.9÷0.01= | 3.5+7.6= |
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