5
$\frac{1}{4}+\frac{1}{6}=$ $\frac{4}{5}+\frac{1}{3}=$ $\frac{1}{7}-\frac{1}{8}=$
$\frac{1}{3}+\frac{3}{8}=$ $\frac{8}{9}-\frac{5}{6}=$ $\frac{1}{8}+\frac{1}{9}=$
$\frac{7}{12}+\frac{1}{6}=$ $\frac{1}{4}+\frac{5}{12}=$ $\frac{1}{10}+\frac{1}{11}=$
$\frac{2}{3}-\frac{2}{5}=$ $\frac{8}{15}-\frac{1}{6}=$ $\frac{1}{4}+\frac{1}{7}=$
$\frac{4}{5}-\frac{1}{4}=$ $\frac{3}{8}+\frac{3}{10}=$ $\frac{1}{5}-\frac{1}{8}=$
$\frac{5}{8}+\frac{2}{7}=$ $\frac{3}{4}-\frac{2}{7}=$ $\frac{1}{3}+\frac{1}{7}=$
$\frac{4}{5}-\frac{3}{8}=$ $\frac{1}{3}+\frac{1}{5}=$ $\frac{1}{5}+\frac{1}{10}=$
$\frac{2}{3}+\frac{3}{5}=$ $\frac{1}{4}-\frac{1}{7}=$ $\frac{1}{2}-\frac{1}{7}=$
$\frac{5}{7}-\frac{5}{14}=$ $\frac{1}{2}+\frac{1}{5}=$ $\frac{1}{9}+\frac{1}{10}=$
$\frac{1}{4}+\frac{1}{6}=$ $\frac{4}{5}+\frac{1}{3}=$ $\frac{1}{7}-\frac{1}{8}=$
$\frac{1}{3}+\frac{3}{8}=$ $\frac{8}{9}-\frac{5}{6}=$ $\frac{1}{8}+\frac{1}{9}=$
$\frac{7}{12}+\frac{1}{6}=$ $\frac{1}{4}+\frac{5}{12}=$ $\frac{1}{10}+\frac{1}{11}=$
$\frac{2}{3}-\frac{2}{5}=$ $\frac{8}{15}-\frac{1}{6}=$ $\frac{1}{4}+\frac{1}{7}=$
$\frac{4}{5}-\frac{1}{4}=$ $\frac{3}{8}+\frac{3}{10}=$ $\frac{1}{5}-\frac{1}{8}=$
$\frac{5}{8}+\frac{2}{7}=$ $\frac{3}{4}-\frac{2}{7}=$ $\frac{1}{3}+\frac{1}{7}=$
$\frac{4}{5}-\frac{3}{8}=$ $\frac{1}{3}+\frac{1}{5}=$ $\frac{1}{5}+\frac{1}{10}=$
$\frac{2}{3}+\frac{3}{5}=$ $\frac{1}{4}-\frac{1}{7}=$ $\frac{1}{2}-\frac{1}{7}=$
$\frac{5}{7}-\frac{5}{14}=$ $\frac{1}{2}+\frac{1}{5}=$ $\frac{1}{9}+\frac{1}{10}=$
答案:
$\square-\square=\frac{3}{10}$ $\square+\square=\frac{8}{15}$

$\square+\square=\frac{5}{12}$ $\square-\square=\frac{2}{63}$

$\square+\square=\frac{5}{12}$ $\square-\square=\frac{2}{63}$
答案:
连一连
$\frac{1}{3}+\frac{1}{5}$ $\frac{1}{10}-\frac{1}{20}$
$\frac{3}{4}+\frac{1}{5}$
$\frac{2}{3}-\frac{3}{5}$
$\frac{1}{4}+\frac{5}{6}$
接近0 接近1 接近$\frac{1}{2}$
$\frac{1}{3}+\frac{1}{5}$ $\frac{1}{10}-\frac{1}{20}$
$\frac{2}{3}-\frac{3}{5}$
接近0 接近1 接近$\frac{1}{2}$
答案:
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