题目内容
| 4.4+6= | 6.4÷0.64= | 0.78÷0.1×100= |
| 100-0.1= | 12.4×5= | 1.6-1.2÷4= |
| 3.6+6.4-3.6+6.4= | 0.25×8= | （12.5-1.25）×0.8= |
分析：根据小数加减乘除的计算方法进行计算即可．
解答：解：
| 4.4+6=10.4， | 6.4÷0.64=10， | 0.78÷0.1×100=780， |
| 100-0.1=99.9， | 12.4×5=62， | 1.6-1.2÷4=1.3， |
| 3.6+6.4-3.6+6.4=12.8， | 0.25×8=2， | （12.5-1.25）×0.8=9． |
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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| 2.5×4= | 0.8+2.7×2= | 0.05×7= | 4.8+2.1+7.9= |
| 3.4-1.8= | 2.5+0.2×2= | 0.02×0.1= | 5.4-2.8= |
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