| 2005+620= | 1-0.09= | 0.45×101= | 2÷0.02= |
| 25π≈ | × = | ÷ = | + = |
5- = | 31×197≈ | 0×0.54= | 0.25×8.5×4= |
| 4.8×11-4.8= | 2.68+9-2.68+9= |
| 2005+620=2625 | 1-0.09=0.91 | 0.45×101=45.45 | 2÷0.02=100 |
| 25π≈78.5 | × =![]() | ÷ =1![]() | + =![]() |
5- =4![]() | 31×197≈6000 | 0×0.54=0 | 0.25×8.5×4=8.5 |
| 4.8×11-4.8=48 | 2.68+9-2.68+9=18 |
分析:根据四则混合运算的运算顺序和计算法则进行计算即可.
点评:最后三道题可以使用运算定律简算.
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