题目内容
4.口算.| $\frac{1}{6}$+$\frac{3}{4}$= | 15×$\frac{2}{5}$= | $\frac{3}{5}$×$\frac{1}{2}$= | $\frac{2}{5}$×$\frac{3}{5}$= |
| $\frac{6}{19}$×0= | $\frac{8}{15}$×$\frac{3}{8}$= | $\frac{7}{11}$×7= | $\frac{3}{5}$-$\frac{3}{5}$= |
| 17×$\frac{4}{51}$= | $\frac{10}{33}$×$\frac{22}{15}$= | $\frac{7}{16}$×$\frac{4}{21}$= | $\frac{9}{38}$×$\frac{9}{27}$= |
分析 根据分数加减乘除法的计算方法进行计算.
解答 解:
| $\frac{1}{6}$+$\frac{3}{4}$=$\frac{11}{12}$ | 15×$\frac{2}{5}$=6 | $\frac{3}{5}$×$\frac{1}{2}$=$\frac{3}{10}$ | $\frac{2}{5}$×$\frac{3}{5}$=$\frac{6}{25}$ |
| $\frac{6}{19}$×0=0 | $\frac{8}{15}$×$\frac{3}{8}$=$\frac{1}{5}$ | $\frac{7}{11}$×7=$\frac{49}{11}$ | $\frac{3}{5}$-$\frac{3}{5}$=0 |
| 17×$\frac{4}{51}$=$\frac{4}{3}$ | $\frac{10}{33}$×$\frac{22}{15}$=$\frac{4}{9}$ | $\frac{7}{16}$×$\frac{4}{21}$=$\frac{1}{12}$ | $\frac{9}{38}$×$\frac{9}{27}$=$\frac{3}{38}$ |
点评 口算时,注意运算符号和数据,然后再进一步计算.
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