1. 直接写出得数。
$2 - \frac{1}{3} =$
$\frac{5}{8} + \frac{7}{8} =$
$\frac{1}{2} + \frac{2}{3} =$
$\frac{3}{10} + \frac{2}{3} =$
$\frac{4}{7} - \frac{1}{2} =$
$\frac{7}{8} - \frac{3}{4} =$
$\frac{7}{20} - 0.35 =$
$\frac{9}{10} - \frac{3}{5} =$
$\frac{13}{23} - \frac{1}{46} =$
$\frac{1}{16} + \frac{3}{8} =$
$\frac{7}{10} + \frac{3}{20} =$
$\frac{19}{36} + \frac{1}{12} =$
$\frac{19}{24} - \frac{2}{3} =$
$\frac{11}{18} - \frac{1}{2} =$
$\frac{9}{22} - \frac{10}{33} =$
$\frac{2}{17} + \frac{10}{51} =$

$\frac{5}{3}$ $\frac{3}{2}$ $\frac{7}{6}$ $\frac{29}{30}$
$\frac{1}{14}$ $\frac{1}{8}$ $0$ $\frac{3}{10}$
$\frac{25}{46}$ $\frac{7}{16}$ $\frac{17}{20}$ $\frac{11}{18}$
$\frac{1}{8}$ $\frac{1}{9}$ $\frac{7}{66}$ $\frac{16}{51}$

2. 算一算，填一填。

(1) $\frac{2}{3}$ $1$ $\frac{2}{9}$ $\frac{5}{9}$
(2) $\frac{19}{12}$ $\frac{2}{3}$ $\frac{7}{6}$ $\frac{5}{6}$

3. 计算下面各题，能简算的要简算。
$\frac{3}{4} - (\frac{2}{5} + \frac{3}{10})$
$\frac{1}{2} + \frac{7}{9} - \frac{4}{9}$
$\frac{7}{15} + \frac{17}{16} + \frac{23}{15} - \frac{1}{16}$
$3 - \frac{6}{19} - \frac{13}{19}$
$\frac{13}{12} - \frac{3}{5} + \frac{11}{12} - 0.4$
$6.52 - \frac{4}{13} - \frac{9}{13} + 3.48$
$\frac{9}{7} + \frac{3}{8} + \frac{1}{8} + \frac{5}{7}$
$\frac{23}{35} - (\frac{5}{6} - \frac{12}{35}) - \frac{1}{6}$
$12.15 - \frac{19}{7} + 7.85 - \frac{2}{7}$

$\frac{1}{20}$ $\frac{5}{6}$ $3$
$2$ $1$ $9$
$2\frac{1}{2}$ $0$ $17$