1. 直接写出得数。 实际用时：分钟
$\frac{1}{7}×7=$
$\frac{9}{10}×5=$
$4×\frac{7}{12}=$
$1.5×\frac{4}{5}=$
$\frac{1}{8}×\frac{1}{3}=$
$\frac{2}{3}×\frac{3}{2}=$
$\frac{5}{24}×\frac{34}{5}=$
$\frac{3}{88}×\frac{1}{3}=$
$\frac{1}{2}×0.5=$
$2.7×\frac{1}{54}=$
$\frac{2}{15}×\frac{3}{5}=$
$\frac{13}{18}×\frac{9}{39}=$
$1.4×\frac{7}{28}=$
$\frac{19}{58}×\frac{29}{19}=$
$\frac{5}{36}×\frac{4}{15}=$
$\frac{7}{12}×\frac{5}{12}=$
$\frac{1}{11}×121=$
$9.9×\frac{7}{9}=$
$\frac{8}{125}×\frac{1000}{3}=$
$\frac{48}{75}×\frac{15}{24}=$
$\frac{1}{4}×\frac{1}{4}=$
$\frac{2}{5}×5=$
$2×\frac{2}{3}=$
$\frac{7}{6}×7=$
$\frac{1}{6}×\frac{3}{4}=$
$\frac{2}{7}×1.4=$
$0.9×\frac{8}{9}=$
$\frac{7}{13}×3.9=$
$\frac{1}{2}×\frac{1}{3}=$
$\frac{1}{2}×4=$
$6×\frac{1}{6}=$
$\frac{3}{4}×\frac{4}{3}=$
$7÷\frac{7}{9}=$
$\frac{7}{6}÷\frac{7}{6}=$
$\frac{8}{9}÷8=$
$\frac{6}{5}÷\frac{12}{5}=$
$\frac{5}{4}÷15=$
$\frac{21}{5}÷\frac{1}{7}=$
$\frac{10}{9}×0.2=$
$\frac{4}{15}÷0.2=$

1. 1 $\frac{9}{2}$ $\frac{7}{3}$ $\frac{6}{5}$
$\frac{1}{24}$ 1 $\frac{17}{12}$ $\frac{1}{88}$
$\frac{1}{4}$ $\frac{1}{20}$ $\frac{2}{25}$ $\frac{1}{6}$
$\frac{7}{20}$ $\frac{1}{2}$ $\frac{1}{27}$ $\frac{35}{144}$
11 $\frac{77}{10}$ $\frac{64}{3}$ $\frac{2}{5}$
$\frac{1}{16}$ 2 $\frac{4}{3}$ $\frac{49}{6}$
$\frac{1}{8}$ $\frac{2}{5}$ $\frac{4}{5}$ $\frac{21}{10}$
$\frac{1}{6}$ 2 1 1
9 1 $\frac{1}{9}$ $\frac{1}{2}$
$\frac{1}{12}$ $\frac{147}{5}$ $\frac{2}{9}$ $\frac{4}{3}$

2. 计算下面各题。
$\frac{3}{7} × 2.8 × \frac{1}{4}$
$( \frac{1}{4} + \frac{3}{5} ) × 2$
$\frac{2}{5} × \frac{3}{7} × 25 × 42$
$\frac{5}{6} × \frac{13}{10} - \frac{5}{6} × \frac{3}{10}$
$\frac{5}{9} × \frac{8}{21} + \frac{13}{21} ÷ \frac{9}{5}$
$\frac{5}{17} × 3.4 ÷ 16$

2. $\frac{3}{10}$ $\frac{17}{10}$ 180
$\frac{5}{6}$ $\frac{5}{9}$ $\frac{1}{16}$