脱式计算。
$14×\frac{5}{7}$
$8×\frac{9}{10}$
$\frac{11}{18}×24$
$\frac{13}{15}×20$
$\frac{1}{5}×10$
$\frac{5}{7}×35$
$\frac{3}{4}×24$
$32×\frac{7}{8}$
$9×\frac{1}{12}$
$10×\frac{1}{6}$
$\frac{13}{49}×21$
$16×\frac{7}{10}$
$6×\frac{2}{17}$
$12×\frac{3}{25}$
$\frac{7}{10}×20$
$\frac{5}{6}×18$
$\frac{7}{8}×32$
$\frac{1}{6}×4$
$\frac{2}{5}×20$
$\frac{1}{4}×8$
$21×\frac{2}{3}$
$100×\frac{9}{50}$
$81×\frac{8}{9}$
$\frac{7}{2}×10$
$\frac{4}{5}×15$
$\frac{2}{17}×6$
$\frac{5}{12}×36$
$\frac{4}{11}×5$

$14×\frac{5}{7}=2×5=10$
$8×\frac{9}{10}=\frac{4×9}{5}=\frac{36}{5}$
$\frac{11}{18}×24=\frac{11×4}{3}=\frac{44}{3}$
$\frac{13}{15}×20=\frac{13×4}{3}=\frac{52}{3}$
$\frac{1}{5}×10=2$
$\frac{5}{7}×35=5×5=25$
$\frac{3}{4}×24=3×6=18$
$32×\frac{7}{8}=4×7=28$
$9×\frac{1}{12}=\frac{3×1}{4}=\frac{3}{4}$
$10×\frac{1}{6}=\frac{5×1}{3}=\frac{5}{3}$
$\frac{13}{49}×21=\frac{13×3}{7}=\frac{39}{7}$
$16×\frac{7}{10}=\frac{8×7}{5}=\frac{56}{5}$
$6×\frac{2}{17}=\frac{12}{17}$
$12×\frac{3}{25}=\frac{36}{25}$
$\frac{7}{10}×20=7×2=14$
$\frac{5}{6}×18=5×3=15$
$\frac{7}{8}×32=7×4=28$
$\frac{1}{6}×4=\frac{1×2}{3}=\frac{2}{3}$
$\frac{2}{5}×20=2×4=8$
$\frac{1}{4}×8=2$
$21×\frac{2}{3}=7×2=14$
$100×\frac{9}{50}=2×9=18$
$81×\frac{8}{9}=9×8=72$
$\frac{7}{2}×10=7×5=35$
$\frac{4}{5}×15=4×3=12$
$\frac{2}{17}×6=\frac{12}{17}$
$\frac{5}{12}×36=5×3=15$
$\frac{4}{11}×5=\frac{20}{11}$