题目内容
3.口算| $\frac{2}{5}$×6= | $\frac{2}{13}$÷$\frac{2}{5}$= | 20÷$\frac{4}{5}$= | $\frac{1}{2}$+$\frac{1}{5}$= | 2$\frac{1}{3}$×$\frac{7}{4}$= |
| $\frac{1}{7}$×$\frac{2}{3}$= | 5.6÷0.08= | $\frac{7}{9}$×$\frac{5}{8}$×0= | 39×$\frac{7}{13}$×$\frac{2}{3}$= | 30÷$\frac{5}{6}$= |
分析 根据分数小数加减乘除法的计算方法解答.
解答 解:
| $\frac{2}{5}$×6=$\frac{12}{5}$ | $\frac{2}{13}$÷$\frac{2}{5}$=$\frac{5}{13}$ | 20÷$\frac{4}{5}$=25 | $\frac{1}{2}$+$\frac{1}{5}$=$\frac{7}{10}$ | 2$\frac{1}{3}$×$\frac{7}{4}$=$\frac{49}{12}$ |
| $\frac{1}{7}$×$\frac{2}{3}$=$\frac{2}{21}$ | 5.6÷0.08=70 | $\frac{7}{9}$×$\frac{5}{8}$×0=0 | 39×$\frac{7}{13}$×$\frac{2}{3}$=14 | 30÷$\frac{5}{6}$=36 |
点评 口算时,注意数据特点和运算符号,细心解答即可.
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