39× × = | 2005+620= | 1- + = | 0.25×8.5×4= |
+ = | 2.68+9-2.68+9= | 4.8×11-4.8= | 5-1.4-1.6= |
| 14÷35= | 2- - = | 8.75-(0.75+3.4)= | 1÷ × =. |
解:39× × =14, | 2005+620=2625, | 1- + =1.6, | 0.25×8.5×4=8.5, |
+ =0.9, | 2.68+9-2.68+9=18, | 4.8×11-4.8=48, | 5-1.4-1.6=2, |
| 14÷35=0.4, | 2- - =1.2, | 8.75-(0.75+3.4)=4.6, | 1÷ × =2.25. |
分析:运用小数、分数、整数的加减乘除法的计算法则及运算定律进行计算即可.
点评:完成本题要细心分析式中数据,能简便计算的要简便计算.
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