1. 直接写出得数。(每题1★)
$\frac {6}{13}-\frac {2}{13}= $ $\frac {5}{12}-\frac {1}{4}= $ $\frac {5}{9}-\frac {1}{3}= $ $1-\frac {3}{10}= $
$\frac {5}{6}+\frac {1}{3}= $ $\frac {2}{7}+2= $ $\frac {1}{4}+\frac {1}{2}= $ $1-\frac {9}{14}= $
$\frac {4}{5}-\frac {4}{5}= $ $\frac {1}{2}-\frac {1}{10}= $ $\frac {7}{11}+\frac {4}{11}= $ $1-\frac {4}{9}= $
$\frac {5}{6}-\frac {2}{3}= $ $0.25-\frac {1}{4}= $ $\frac {1}{3}+\frac {1}{8}= $ $7-\frac {5}{3}= $
$\frac {7}{8}-\frac {3}{4}= $ $\frac {4}{9}+\frac {8}{9}= $ $\frac {4}{5}-\frac {3}{10}= $ $1-\frac {2}{5}-\frac {3}{5}= $

$\frac{4}{13}$ $\frac{1}{6}$ $\frac{2}{9}$ $\frac{7}{10}$
$\frac{7}{6}$ $2\frac{2}{7}$ $\frac{3}{4}$ $\frac{5}{14}$
0 $\frac{2}{5}$ 1 $\frac{5}{9}$
$\frac{1}{6}$ 0 $\frac{11}{24}$ $5\frac{1}{3}$
$\frac{1}{8}$ $\frac{4}{3}$ $\frac{1}{2}$ 0

2. 计算下面各题,能简算的要简算。(每题3★)
$\frac {2}{7}+\frac {2}{3}+\frac {5}{7}$ $1-(\frac {3}{10}-\frac {1}{6})$ $\frac {4}{15}+\frac {7}{10}+\frac {4}{15}+\frac {3}{10}$
$\frac {10}{11}+(\frac {1}{11}+\frac {2}{5})$ $\frac {17}{16}-(\frac {1}{4}+\frac {3}{8})$ $\frac {13}{24}+\frac {2}{3}-\frac {5}{6}$
$13-\frac {5}{13}-\frac {8}{13}$ $\frac {14}{9}-\frac {7}{11}+\frac {4}{9}-\frac {4}{11}$ $0.75+\frac {10}{17}+\frac {1}{4}+\frac {7}{17}$

$1\frac{2}{3}$ $\frac{13}{15}$ $1\frac{8}{15}$
$1\frac{2}{5}$ $\frac{7}{16}$ $\frac{3}{8}$
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