计算下面各题,能简算的要简算。
$\frac {19}{20}+(\frac {4}{5}-\frac {7}{40})$ $12-\frac {3}{4}+\frac {1}{4}$ $\frac {1}{7}+\frac {13}{15}+\frac {6}{7}$
$\frac {29}{21}-(\frac {8}{21}-\frac {1}{4})$ $\frac {7}{6}-\frac {4}{5}-\frac {1}{5}$ $\frac {4}{5}+\frac {3}{10}-\frac {11}{20}$
$\frac {3}{7}+\frac {5}{9}+\frac {4}{7}$ $\frac {3}{10}+\frac {3}{5}+\frac {2}{5}+\frac {7}{10}$ $\frac {17}{13}-\frac {3}{8}-\frac {5}{8}$
$\frac {6}{7}+(\frac {4}{5}-\frac {3}{10})$ $\frac {7}{10}-\frac {1}{4}+\frac {3}{10}-\frac {3}{4}$ $\frac {5}{12}+\frac {11}{16}-\frac {5}{16}+\frac {7}{12}$
$\frac {5}{6}-\frac {1}{3}+\frac {2}{5}$ $\frac {1}{4}+\frac {5}{9}-\frac {1}{3}$ $2.5-\frac {1}{4}-\frac {3}{4}$
$1-(\frac {7}{12}-\frac {1}{4})$ $\frac {1}{4}+\frac {13}{15}+\frac {7}{4}+\frac {2}{15}$ $5\frac {11}{35}-(\frac {11}{35}+\frac {6}{13})-\frac {7}{13}$

$\frac{63}{40}$ $\frac{23}{2}$ $\frac{28}{15}$ $\frac{5}{4}$ $\frac{1}{6}$ $\frac{11}{20}$ $\frac{14}{9}$ 2 $\frac{4}{13}$
$\frac{19}{14}$ 0 $\frac{11}{8}$ $\frac{9}{10}$ $\frac{17}{36}$ 1.5 $\frac{2}{3}$ 3 4