1. 口算题。
$3 - 1.95 =$
$\frac{7}{8} - \frac{3}{4} =$
$\frac{1}{4} + \frac{1}{3} =$
$\frac{1}{2} + \frac{5}{4} =$
$\frac{4}{5} - \frac{7}{10} =$
$\frac{1}{4} + 3 =$
$\frac{3}{10} + \frac{1}{4} + \frac{2}{5} =$
$1 - \frac{1}{4} - \frac{1}{2} =$
$\frac{3}{4} - \frac{1}{6} - \frac{1}{2} =$
$\frac{3}{5} + \frac{7}{8} + \frac{2}{5} =$
$\frac{1}{2} + \frac{4}{5} - \frac{3}{10} =$
$\frac{7}{8} - ( \frac{2}{3} + \frac{1}{6} ) =$

1. 1.05 $\frac{1}{8}$ $\frac{7}{12}$ $\frac{7}{4}$ $\frac{1}{10}$ $3\frac{1}{4}$ $\frac{19}{20}$ $\frac{1}{4}$ $\frac{1}{12}$ $1\frac{7}{8}$ $1$ $\frac{1}{24}$

2. 计算下面各题。(能用简便方法计算的要用简便方法计算)
$\frac{8}{9} - \frac{1}{6} + \frac{2}{3}$
$\frac{1}{4} + \frac{5}{6} - \frac{3}{4}$
$1 - ( \frac{3}{4} - \frac{2}{5} )$
$\frac{5}{6} - \frac{5}{8} + \frac{1}{6} - \frac{3}{8}$
$\frac{1}{8} + \frac{8}{15} + \frac{7}{8} - \frac{3}{15}$
$\frac{8}{9} - ( \frac{2}{9} + \frac{1}{3} )$

2. $\frac{25}{18}$ $\frac{1}{3}$ $\frac{13}{20}$ $0$ $1\frac{1}{3}$ $\frac{1}{3}$