《2025年心算口算巧算六年级上册北师大版》

计算下面各题。
$\frac{3}{5}÷\frac{3}{11}×\frac{2}{5}$
$25×(\frac{1}{4}×\frac{4}{5})$
$\frac{2}{7}÷\frac{5}{21}×\frac{3}{7}$
$\frac{2}{5}×(\frac{25}{14}÷\frac{10}{9})$
$\frac{1}{4}÷\frac{1}{11}×\frac{3}{4}$
$\frac{7}{9}×\frac{2}{3}×\frac{1}{2}$
$\frac{2}{5}×\frac{3}{14}×\frac{3}{5}$
$\frac{3}{10}÷\frac{7}{30}×\frac{1}{5}$
$15÷\frac{3}{5}÷\frac{5}{9}$
$36×(\frac{1}{4}×\frac{8}{9})$
$\frac{1}{3}×\frac{3}{5}÷\frac{1}{5}$
$\frac{4}{5}÷3×\frac{4}{5}$

答案： $\frac{3}{5}÷\frac{3}{11}×\frac{2}{5}$
解：$\frac{3}{5}×\frac{11}{3}=\frac{11}{5}$，$\frac{11}{5}×\frac{2}{5}=\frac{22}{25}$
$25×(\frac{1}{4}×\frac{4}{5})$
解：$\frac{1}{4}×\frac{4}{5}=\frac{1}{5}$，$25×\frac{1}{5}=5$
$\frac{2}{7}÷\frac{5}{21}×\frac{3}{7}$
解：$\frac{2}{7}×\frac{21}{5}=\frac{6}{5}$，$\frac{6}{5}×\frac{3}{7}=\frac{18}{35}$
$\frac{2}{5}×(\frac{25}{14}÷\frac{10}{9})$
解：$\frac{25}{14}×\frac{9}{10}=\frac{45}{28}$，$\frac{2}{5}×\frac{45}{28}=\frac{9}{14}$
$\frac{1}{4}÷\frac{1}{11}×\frac{3}{4}$
解：$\frac{1}{4}×11=\frac{11}{4}$，$\frac{11}{4}×\frac{3}{4}=\frac{33}{16}$
$\frac{7}{9}×\frac{2}{3}×\frac{1}{2}$
解：$\frac{14}{27}×\frac{1}{2}=\frac{7}{27}$
$\frac{2}{5}×\frac{3}{14}×\frac{3}{5}$
解：$\frac{6}{70}×\frac{3}{5}=\frac{9}{175}$
$\frac{3}{10}÷\frac{7}{30}×\frac{1}{5}$
解：$\frac{3}{10}×\frac{30}{7}=\frac{9}{7}$，$\frac{9}{7}×\frac{1}{5}=\frac{9}{35}$
$15÷\frac{3}{5}÷\frac{5}{9}$
解：$15×\frac{5}{3}=25$，$25×\frac{9}{5}=45$
$36×(\frac{1}{4}×\frac{8}{9})$
解：$\frac{1}{4}×\frac{8}{9}=\frac{2}{9}$，$36×\frac{2}{9}=8$
$\frac{1}{3}×\frac{3}{5}÷\frac{1}{5}$
解：$\frac{1}{5}÷\frac{1}{5}=1$
$\frac{4}{5}÷3×\frac{4}{5}$
解：$\frac{4}{5}×\frac{1}{3}=\frac{4}{15}$，$\frac{4}{15}×\frac{4}{5}=\frac{16}{75}$