脱式计算。
$\frac{6}{7}×5$
$\frac{11}{12}×24$
$\frac{2}{3}×\frac{33}{12}$
$\frac{5}{8}×6$
$\frac{7}{15}×35$
$\frac{5}{24}×\frac{11}{15}$
$\frac{14}{15}×5$
$\frac{5}{11}×33$
$\frac{7}{36}×\frac{12}{11}$
$\frac{17}{18}×9$
$\frac{16}{45}×9$
$\frac{7}{8}×\frac{13}{14}$
$\frac{5}{22}×11$
$\frac{4}{45}×15$
$\frac{5}{7}×\frac{14}{15}$
$\frac{5}{24}×8$
$\frac{13}{15}×30$
$\frac{5}{6}×\frac{17}{20}$

$\frac{6}{7}×5=\frac{6×5}{7}=\frac{30}{7}$
$\frac{11}{12}×24=11×2=22$
$\frac{2}{3}×\frac{33}{12}=\frac{1×11}{1×6}=\frac{11}{6}$
$\frac{5}{8}×6=\frac{5×3}{4}=\frac{15}{4}$
$\frac{7}{15}×35=\frac{7×7}{3}=\frac{49}{3}$
$\frac{5}{24}×\frac{11}{15}=\frac{1×11}{24×3}=\frac{11}{72}$
$\frac{14}{15}×5=\frac{14×1}{3}=\frac{14}{3}$
$\frac{5}{11}×33=5×3=15$
$\frac{7}{36}×\frac{12}{11}=\frac{7×1}{3×11}=\frac{7}{33}$
$\frac{17}{18}×9=\frac{17×1}{2}=\frac{17}{2}$
$\frac{16}{45}×9=\frac{16×1}{5}=\frac{16}{5}$
$\frac{7}{8}×\frac{13}{14}=\frac{1×13}{8×2}=\frac{13}{16}$
$\frac{5}{22}×11=\frac{5×1}{2}=\frac{5}{2}$
$\frac{4}{45}×15=\frac{4×1}{3}=\frac{4}{3}$
$\frac{5}{7}×\frac{14}{15}=\frac{1×2}{1×3}=\frac{2}{3}$
$\frac{5}{24}×8=\frac{5×1}{3}=\frac{5}{3}$
$\frac{13}{15}×30=13×2=26$
$\frac{5}{6}×\frac{17}{20}=\frac{1×17}{6×4}=\frac{17}{24}$