直接写出得数. ×12= | + = | 10× = | - = | 1÷ = |
12÷ = | ÷ = | × = | ÷ = | ÷ = |
| 18+46= | 2.5×0.8= | 3.8-0.9= | 36÷2= | 3.5÷0.5= |
解: ×12=2, | + = , | 10× =8, | - = , | 1÷ =4, |
12÷ =18, | ÷ = , | × = , | ÷ = , | ÷ = , |
| 18+46=64, | 2.5×0.8=2, | 3.8-0.9=2.9, | 36÷2=18, | 3.5÷0.5=7. |
分析:根据分数、小数和整数的加减乘除的计算方法进行计算即可.
点评:口算时,要看清数据和运算符号,然后再进一步进行计算即可.
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