《2025年同步练习西南大学出版社六年级数学上册西师大版四川专版》

1. 口算。
$\frac{7}{13}+\frac{6}{13}=$1 $\frac{3}{8}-\frac{1}{4}=$$\frac{1}{8}$ $\frac{7}{13}×\frac{26}{21}=$$\frac{2}{3}$ $\frac{3}{4}÷\frac{6}{7}=$$\frac{7}{8}$
$\frac{7}{5}×\frac{15}{28}=$$\frac{3}{4}$ $\frac{14}{39}÷\frac{7}{13}=$$\frac{2}{3}$ $\frac{1}{7}+\frac{5}{14}=$$\frac{1}{2}$ $\frac{3}{2}-\frac{7}{10}=$$\frac{4}{5}$

答案： 1. $\frac{7}{13}+\frac{6}{13}=\frac{13}{13}=1$
2. $\frac{3}{8}-\frac{1}{4}=\frac{3}{8}-\frac{2}{8}=\frac{1}{8}$
3. $\frac{7}{13}×\frac{26}{21}=\frac{7×26}{13×21}=\frac{2}{3}$
4. $\frac{3}{4}÷\frac{6}{7}=\frac{3}{4}×\frac{7}{6}=\frac{7}{8}$
5. $\frac{7}{5}×\frac{15}{28}=\frac{7×15}{5×28}=\frac{3}{4}$
6. $\frac{14}{39}÷\frac{7}{13}=\frac{14}{39}×\frac{13}{7}=\frac{2}{3}$
7. $\frac{1}{7}+\frac{5}{14}=\frac{2}{14}+\frac{5}{14}=\frac{7}{14}=\frac{1}{2}$
8. $\frac{3}{2}-\frac{7}{10}=\frac{15}{10}-\frac{7}{10}=\frac{8}{10}=\frac{4}{5}$

2. 计算。
$5-\frac{7}{8}×\frac{16}{21}$ $(\frac{3}{4}-\frac{5}{8})÷\frac{5}{9}$ $(\frac{1}{2}+\frac{1}{3})÷(\frac{2}{3}-\frac{1}{3})$
$\frac{2}{5}×\frac{2}{3}+\frac{2}{5}÷\frac{2}{3}$ $\frac{7}{8}÷[1-(\frac{1}{4}+\frac{2}{3})]$ $\frac{7}{10}÷5-\frac{1}{5}×\frac{2}{5}$

答案： 2. 计算。
1. $5 - \frac{7}{8} × \frac{16}{21}$
$= 5 - \frac{2}{3}$
$= 4\frac{1}{3}$
2. $(\frac{3}{4} - \frac{5}{8}) ÷ \frac{5}{9}$
$= (\frac{6}{8} - \frac{5}{8}) × \frac{9}{5}$
$= \frac{1}{8} × \frac{9}{5}$
$= \frac{9}{40}$
3. $(\frac{1}{2} + \frac{1}{3}) ÷ (\frac{2}{3} - \frac{1}{3})$
$= (\frac{3}{6} + \frac{2}{6}) ÷ \frac{1}{3}$
$= \frac{5}{6} × 3$
$= \frac{5}{2}$
4. $\frac{2}{5} × \frac{2}{3} + \frac{2}{5} ÷ \frac{2}{3}$
$= \frac{4}{15} + \frac{2}{5} × \frac{3}{2}$
$= \frac{4}{15} + \frac{3}{5}$
$= \frac{4}{15} + \frac{9}{15}$
$= \frac{13}{15}$
5. $\frac{7}{8} ÷ [1 - (\frac{1}{4} + \frac{2}{3})]$
$= \frac{7}{8} ÷ [1 - (\frac{3}{12} + \frac{8}{12})]$
$= \frac{7}{8} ÷ [1 - \frac{11}{12}]$
$= \frac{7}{8} ÷ \frac{1}{12}$
$= \frac{7}{8} × 12$
$= \frac{21}{2}$
6. $\frac{7}{10} ÷ 5 - \frac{1}{5} × \frac{2}{5}$
$= \frac{7}{10} × \frac{1}{5} - \frac{2}{25}$
$= \frac{7}{50} - \frac{4}{50}$
$= \frac{3}{50}$