题目内容
| 口算 1.8×5= |
1.6÷0.4= | 7.2÷0.08= |
| 4-1.64= | 5.4÷0.2= | 10.8÷4= |
分析：根据小数加减乘除的计算方法进行计算即可．
解答：
故答案为：9，4，90，2.36，27，2.7．
| 解：1.8×5=9 | 1.6÷0.4=4 | 7.2÷0.08=90 |
| 4-1.64=2.36 | 5.4÷0.2=27 | 10.8÷4=2.7 |
点评：小数的口算，要注意运算符号和数据，更要注意小数点的位置．
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| 12.4+7.6= | 8×0.5= | 0.72÷36= | 9×2.5+2.5= |
| 1.8÷3= | 2.3÷2= | 6.5÷5= | 2.14÷2= |
| 2.5×4= | 2.7×2= | 0.5×7= | 4.8+3.6+5.2= |
| 3.4÷1.7= | 2.5+0.2= | 4.5÷5= | 5+2.8= |
| 0.8×0.3= | 13.5×2×0= | 5.25÷5= | 4×2.2= |
| 0.12×0.5= | 1.8×5= | 6.24÷2= | 2.83-1.43= |
| 1.2+2.9= | 3.8÷2= | 1.32×3= | 4.6×7= |
口算．
| 8.5+1.3= | 15.7-0.4= | 3.8×2= | 2.6×0.2= | 6.9÷3= |
| 1÷0.4= | 42÷84= | 4-0.17= | 0.8×1.25= | 7.3÷0.01= |