题目内容
2．算一算：| 8.2+4.08= | 1-0.72= | 0.4×0.025= | 7-0.71-0.29= |
| 8.1÷0.03= | 0.24×4= | 7.2÷2.4= | 0.9÷0.01= |
| 6.3+7= | 4.8÷0.08= | 9+0.1= | 3-0.67-0.33= |
| 0.08÷0.2= | 0.2×0.4= | 1÷0.05= | 0+2÷5= |
| 0.081×100= | 7.96×10= | 40万-13万= | 0.45+3.5+.055= |
| 1-0.1= | 0.31+0.3= | 0.72÷1.2= | 0.05×1= |
| 4.2+5.08= | 7.2÷0.072= | 4.3-3= | 0.75÷1.5= |
| 1.05-0.95= | 2.5×4= | 2.5×2.4= | 3.2-1.34-1.66= |
| 12.8-0.28= | 1.25×0.8= | 5.6-5.6÷7= | 3.60.7÷3.6×0.7= |
| 0.8+0.2-0.8+0.2= | 1÷1.25÷4= | 8.4×5= | 0×9.56+7.2= |
分析 根据小数加减乘除法的计算方法求解；
7-0.71-0.29，3-0.67-0.33，3.2-1.34-1.66根据减法的性质简算；
3.6×0.7÷3.6×0.7根据乘法交换律和结合律简算；
0.8+0.2-0.8+0.2根据加法交换律和结合律简算．
解答 解：
| 8.2+4.08=12.28 | 1-0.72=0.28 | 0.4×0.025=0.01 | 7-0.71-0.29=6 |
| 8.1÷0.03=270 | 0.24×4=0.96 | 7.2÷2.4=3 | 0.9÷0.01=90 |
| 6.3+7=13.3 | 4.8÷0.08=60 | 9+0.1=9.1 | 3-0.67-0.33=2 |
| 0.08÷0.2=0.4 | 0.2×0.4=0.08 | 1÷0.05=20 | 0+2÷5=0.4 |
| 0.081×100=8.1 | 7.96×10=79.6 | 40万-13万=27万 | 0.45+3.5+0.55=4.5 |
| 1-0.1=0.9 | 0.31+0.3=0.61 | 0.72÷1.2=0.6 | 0.05×1=0.05 |
| 4.2+5.08=9.28 | 7.2÷0.072=100 | 4.3-3=1.3 | 0.75÷1.5=0.5 |
| 1.05-0.95=0.2 | 2.5×4=10 | 2.5×2.4=6 | 3.2-1.34-1.66=0.2 |
| 12.8-0.28=12.52 | 1.25×0.8=1 | 5.6-5.6÷7=4.8 | 3.6×0.7÷3.6×0.7=0.49 |
| 0.8+0.2-0.8+0.2=0.4 | 1÷1.25÷4=0.2 | 8.4×5=42 | 0×9.56+7.2=7.2 |
点评 本题考查了简单的运算，要注意根据运算法则和运算定律快速准确的得出答案．
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