第31页 - 亮点给力提优课时作业本五年级数学江苏版

$\frac{1}{4}$

$\frac{29}{28}$

$\frac{11}{24}$

$\frac{1}{2}$

$\frac{5}{18}$

$\frac{5}{36}$

$\frac{5}{6}$

$\frac{2}{3}$

$ \begin{aligned}解：x&=\frac {2}{3}-\frac {1}{9} \\ x&=\frac {5}{9} \\ \end{aligned}$

$ \begin{aligned} 解：x&=\frac {5}{6}+\frac {5}{8} \\ x&=\frac {35}{24} \\ \end{aligned}$

$ \begin{aligned} 解：5x&=\frac {3}{8}+\frac {5}{8} \\ 5x&=1 \\ x&=\frac {1}{5} \\ \end{aligned}$

$ \begin{aligned} 解：x+\frac {1}{5}&=\frac {2}{3} \\ x&=\frac {7}{15} \\ \end{aligned}$

$=\frac {7}{8}+\frac {6}{8}+\frac {1}{3}$

$=\frac {13}{8}+\frac {1}{3}$

$=\frac {47}{24}$

$=\frac {5}{6}-\frac {8}{15}$

$=\frac {3}{10}$

$=5-(\frac {5}{11}+\frac {17}{11})$

$=5-2$

$=3$

$=(\frac {23}{15}+\frac {7}{15})-(\frac {7}{12}+\frac {5}{12})$

$=2-1$

$=1$

$=\frac {10}{21}+\frac {11}{21}-1$

$=1-1$

$=0$

$=(\frac {2}{3}+\frac {1}{3})-(\frac{5}{12}+\frac {7}{12})$

$=1-1$

$=0$