1 直接写出得数。(每题1分,共20分)
$1+\frac {6}{13}= $ $\frac {7}{3}+\frac {4}{3}= $ $\frac {1}{2}-\frac {1}{5}= $ $\frac {9}{16}-\frac {5}{12}+\frac {3}{16}= $
$\frac {3}{5}+\frac {2}{5}= $ $\frac {7}{4}+\frac {5}{4}= $ $\frac {9}{14}-\frac {5}{14}= $ $\frac {5}{6}-\frac {1}{6}+\frac {1}{6}= $
$\frac {2}{3}-\frac {1}{6}= $ $\frac {7}{9}+\frac {2}{9}= $ $1-\frac {3}{5}= $ $\frac {3}{10}+\frac {7}{10}-\frac {6}{11}= $
$\frac {1}{8}+\frac {1}{3}= $ $0.4+\frac {3}{4}= $ $4-\frac {7}{3}= $ $\frac {6}{7}+\frac {2}{9}+\frac {1}{7}= $
$\frac {3}{7}+\frac {4}{7}= $ $\frac {2}{3}-\frac {2}{5}= $ $\frac {1}{6}+\frac {1}{7}= $ $2-\frac {5}{7}-\frac {2}{7}= $

$\frac{19}{13}$ $\frac{11}{3}$ $\frac{3}{10}$ $\frac{1}{3}$
1 3 $\frac{2}{7}$ $\frac{5}{6}$
$\frac{1}{2}$ 1 $\frac{2}{5}$ $\frac{5}{11}$
$\frac{11}{24}$ $\frac{23}{20}$ $\frac{5}{3}$ $\frac{11}{9}$
1 $\frac{4}{15}$ $\frac{13}{42}$ 1

2 计算下列各题,能简算的要简算。(每题3分,共18分)
$\frac {5}{11}+\frac {5}{13}+\frac {6}{11}$ $2-(\frac {1}{3}+\frac {5}{3})$ $\frac {13}{15}+\frac {13}{15}+\frac {2}{5}+\frac {2}{5}$
$\frac {1}{10}+\frac {3}{8}-\frac {2}{5}$ $\frac {1}{2}+\frac {3}{10}-\frac {1}{5}$ $\frac {4}{5}+(\frac {3}{8}-\frac {1}{4})$

$\frac{18}{13}$ 0 $\frac{38}{15}$
$\frac{3}{40}$ $\frac{3}{5}$ $\frac{37}{40}$

3 解方程。(每题4分,共12分)
$x+\frac {3}{11}-\frac {2}{11}= \frac {4}{11}$ $2x-\frac {5}{6}= \frac {1}{6}$ $x+\frac {11}{10}= 2$

解:$x=\frac{3}{11}$ 解:$x=\frac{1}{2}$ 解:$x=\frac{9}{10}$