0÷ × = | = | 1.7×4×2.5= | 200×13.2%= |
| 7÷1.4= | 9÷ = | ( )×4= | 2×115%= |
4.5×3× = | 3-3× = | = | 3.25+7= |
0÷ × =0, | = , | 1.7×4×2.5=17, | 200×13.2%=26.4, |
| 7÷1.4=5, | 9÷ =15, | ( )×4=3.5, | 2×115%=2.3, |
4.5×3× =5.4, | 3-3× =2.5, | = , | 3.25+7=10.25. |
分析:根据分数、小数和百分数加减乘除的计算方法进行计算.
1.7×4×2.5根据乘法结合律进行计算;
(
)×4根据乘法分配律进行计算.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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