| 直接写出得数: 36+79= | 15÷0.1= | 9.1-1.9= | 7.2÷0.6= |
| 0.25×8= | ÷ = | - = | × = |
| 0.25×4×1.2= | + = | 0.52= | 0.74×0.6+0.74×0.4= |
| 解:36+79=115, | 15÷0.1=150, | 9.1-1.9=7.2, | 7.2÷0.6=12, |
| 0.25×8=2, | ÷ = , | - = , | × = , |
| 0.25×4×1.2=1.2, | + = , | 0.52=0.25, | 0.74×0.6+0.74×0.4=0.74. |
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,0.25,0.74.分析:按照整数、小数、分数的四则运算方法进行计算,对于混合运算题,能简算的要简算,不能简算的就按照运算顺序计算;如:简算0.25×4×1.2,先算0.25×4=1,再算1×1.2=1.2;简算0.74×0.6+0.74×0.4,先算0.6+0.4=1,再算0.74×1=0.74;0.52表示两个0.5相乘,得积为0.25.
点评:此题考查看算式直接写得数,按照整数、分数、小数的运算法则进行计算即可,对于四则混合运算题能简算的要简算,不能简算的就按运算顺序进行计算.
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