| 0.77+0.33= | 41×101= | 9+ = | ÷7= | 0.9-0.26= |
4- - = | × ÷ × = | - = | 3.25×4= | ÷ = |
| 269÷89≈ | 449+542≈ | 401-199≈ | 497×38≈. |
| 解:0.77+0.33=1.1, | 41×101=4141, | 9+ =9 , | ÷7= , | 0.9-0.26=0.64, |
4- - =3, | × ÷ × = , | - = , | 3.25×4=13, | ÷ = , |
| 269÷89≈3, | 449+542≈1000, | 401-199≈200, | 497×38≈20000. |
分析:根据小数、分数和整数加减乘除的计算方法进行计算即可.
点评:口算时,注意运算符号和数据,然后再进一步计算即可.
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