1. 直接写出得数。
$\frac{1}{10} + \frac{1}{7} =$
$\frac{3}{7} + \frac{4}{7} =$
$\frac{1}{5} + \frac{2}{3} =$
$\frac{6}{7} + \frac{4}{5} + \frac{1}{7} =$
$\frac{4}{7} - \frac{1}{3} =$
$\frac{3}{5} - 0.4 =$
$7 - \frac{5}{3} =$
$\frac{7}{8} - \frac{5}{18} + \frac{1}{8} =$
$\frac{1}{3} + \frac{1}{9} =$
$0.75 - \frac{3}{4} =$
$\frac{3}{4} + \frac{7}{8} =$
$5 - 7 ÷ 14 =$
$\frac{5}{9} + \frac{1}{2} =$
$\frac{3}{4} - \frac{1}{12} =$
$\frac{13}{20} - \frac{1}{4} =$
$1 - \frac{1}{2} - \frac{1}{4} - \frac{1}{8} =$

1. $\frac{17}{70}$ 1 $\frac{13}{15}$ $1\frac{4}{5}$ $\frac{5}{21}$ 0.2 $\frac{16}{3}$ $\frac{13}{18}$ $\frac{4}{9}$ 0 $\frac{13}{8}$ $4\frac{1}{2}$ $\frac{19}{18}$ $\frac{2}{3}$ $\frac{2}{5}$ $\frac{1}{8}$

2. 填一填。(每题最后一个空填小数)
(1) $\frac{3}{4} = ( ) ÷ 24 = \frac{24}{( )} = \frac{( )}{16} = ( )$
(2) $\frac{24}{( )} = 6 ÷ ( ) = \frac{3}{8} = ( ) ÷ 32 = \frac{( )}{24} = ( )$

2. (1) 18 32 12 0.75
(2) 64 16 12 9 0.375

3. 计算下面各题，能简算的要简算。
$\frac{1}{2} + \frac{3}{5} - \frac{1}{6}$
$\frac{3}{4} - (\frac{9}{14} - \frac{1}{4})$
$2.64 - \frac{3}{4} + 3.36 - \frac{1}{4}$
$\frac{3}{7} + \frac{1}{4} + \frac{4}{7}$
$\frac{8}{13} + \frac{8}{17} + \frac{5}{13} + \frac{9}{17}$
$\frac{3}{10} - \frac{2}{9} + \frac{17}{10} - \frac{7}{9}$
$\frac{4}{23} + (\frac{3}{5} - \frac{4}{23})$
$\frac{3}{4} + \frac{5}{11} - \frac{5}{8} + \frac{6}{11}$
$\frac{17}{15} - (\frac{15}{19} - \frac{8}{15} + \frac{4}{19})$

$\frac{14}{15}$ $\frac{5}{14}$ 5 $1\frac{1}{4}$ 2 1 $\frac{3}{5}$ $1\frac{1}{8}$ $\frac{2}{3}$