$\frac{3}{11} × 33 =$
$\frac{5}{17} × 34 =$
$\frac{13}{6} × 18 =$
$\frac{2}{3} × 15 × \frac{4}{5} =$
$\frac{6}{25} × 1.5 =$
$5.6 × \frac{9}{8} =$
$\frac{5}{9} × \frac{3}{4} =$
$\frac{3}{4} × \frac{2}{5} × \frac{5}{7} =$
$\frac{7}{6} × \frac{3}{14} =$
$3.6 × \frac{7}{6} =$
$6.6 × \frac{2}{3} =$
$\frac{4}{9} × \frac{2}{27} × 27 =$
$\frac{5}{9} × \frac{3}{5} =$
$\frac{8}{11} × 0.5 =$
$\frac{8}{9} × \frac{2}{3} =$
$\frac{5}{14} × \frac{2}{15} × \frac{7}{5} =$

1. 9 10 39 8
$\frac{9}{25}$ 6.3 $\frac{5}{12}$ $\frac{3}{14}$
$\frac{1}{4}$ 4.2 4.4 $\frac{8}{9}$
$\frac{1}{3}$ $\frac{4}{11}$ $\frac{16}{27}$ $\frac{1}{15}$

2 脱式计算（能简算的要简算）
建议用时6分钟 评价：☆☆☆
$17× \frac{7}{25}× \frac{11}{17}$
$25× ( \frac{7}{100} + 1 )$
$\frac{4}{15}× \frac{3}{7} + \frac{4}{15}× \frac{4}{7}$
$\frac{5}{12}× \frac{15}{16}× \frac{24}{25}$
$18× ( \frac{1}{2} + \frac{2}{3} - \frac{5}{6} )$
$2.4× \frac{5}{6} + \frac{5}{6}× 3.6$
$\frac{13}{88}× 87 + \frac{13}{88}$
$18× ( \frac{1}{18} - \frac{1}{19} )× 19$
$5\frac{1}{5}× 130 + 13× 48$

2. $\frac{77}{25}$ $26\frac{3}{4}$ $\frac{4}{15}$
$\frac{3}{8}$ 6 5
13 1 1300

在学校举办的书法比赛中，获三等奖的同学有 72 名，获二等奖的人数是三等奖的$\frac{1}{3}$，获一等奖的人数是二等奖的$\frac{1}{2}$，获一等奖的同学有（）名。

3. 12