| 直接写得数. 348-199= | 8- = | 3.46+54= | 1-0.09= |
| 910÷7= | 0.25×0.4= | 1÷ = | 36÷ = |
| 4.2×100= | ÷0.75= | 2÷7+ = | 4.5-4.5× = |
| 348-199=149, | 8- =3.75, | 3.46+54=57.46, | 1-0.09=0.91, |
| 910÷7=130, | 0.25×0.4=0.1, | 1÷ = , | 36÷ =63, |
| 4.2×100=420, | ÷0.75=1, | 2÷7+ =1, | 4.5-4.5× = . |
分析:根据整数、分数、小数的加减乘除的计算方法进行计算即可.
点评:进行口算时,注意运算符号和数据,再进行计算,能简算的要简算.
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