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（1）直接写出得数。
$\frac{5}{6} × 9=$
$\frac{7}{9} ÷ \frac{7}{3}=$
$\frac{5}{3} × \frac{3}{5}=$
$\frac{10}{81} × 9=$
$5 ÷ \frac{5}{7}=$
$8 × \frac{9}{4}=$
$\frac{6}{5} ÷ 10=$
$18 ÷ \frac{1}{3}=$
$\frac{12}{17} ÷ 4=$
$\frac{5}{11} ÷ \frac{7}{11}=$
$\frac{1}{8} ÷ \frac{15}{2}=$
$\frac{1}{8} × 8 ÷ \frac{1}{3}=$
$\frac{6}{19} × \frac{1}{2}=$
$0 ÷ \frac{21}{4}=$
$\frac{1}{9} × 72 × \frac{13}{8}=$
$70^2=$
$0.05^2=$
$200^2=$
$\frac{5}{6} × 9=$
$\frac{7}{9} ÷ \frac{7}{3}=$
$\frac{5}{3} × \frac{3}{5}=$
$\frac{10}{81} × 9=$
$5 ÷ \frac{5}{7}=$
$8 × \frac{9}{4}=$
$\frac{6}{5} ÷ 10=$
$18 ÷ \frac{1}{3}=$
$\frac{12}{17} ÷ 4=$
$\frac{5}{11} ÷ \frac{7}{11}=$
$\frac{1}{8} ÷ \frac{15}{2}=$
$\frac{1}{8} × 8 ÷ \frac{1}{3}=$
$\frac{6}{19} × \frac{1}{2}=$
$0 ÷ \frac{21}{4}=$
$\frac{1}{9} × 72 × \frac{13}{8}=$
$70^2=$
$0.05^2=$
$200^2=$
答案
$\frac{5}{6} × 9=\frac{15}{2}$
$\frac{7}{9} ÷ \frac{7}{3}=\frac{1}{3}$
$\frac{5}{3} × \frac{3}{5}=1$
$\frac{10}{81} × 9=\frac{10}{9}$
$5 ÷ \frac{5}{7}=7$
$8 × \frac{9}{4}=18$
$\frac{6}{5} ÷ 10=\frac{3}{25}$
$18 ÷ \frac{1}{3}=54$
$\frac{12}{17} ÷ 4=\frac{3}{17}$
$\frac{5}{11} ÷ \frac{7}{11}=\frac{5}{7}$
$\frac{1}{8} ÷ \frac{15}{2}=\frac{1}{60}$
$\frac{1}{8} × 8 ÷ \frac{1}{3}=3$
$\frac{6}{19} × \frac{1}{2}=\frac{3}{19}$
$0 ÷ \frac{21}{4}=0$
$\frac{1}{9} × 72 × \frac{13}{8}=13$
$70^2=4900$
$0.05^2=0.0025$
$200^2=40000$
$\frac{7}{9} ÷ \frac{7}{3}=\frac{1}{3}$
$\frac{5}{3} × \frac{3}{5}=1$
$\frac{10}{81} × 9=\frac{10}{9}$
$5 ÷ \frac{5}{7}=7$
$8 × \frac{9}{4}=18$
$\frac{6}{5} ÷ 10=\frac{3}{25}$
$18 ÷ \frac{1}{3}=54$
$\frac{12}{17} ÷ 4=\frac{3}{17}$
$\frac{5}{11} ÷ \frac{7}{11}=\frac{5}{7}$
$\frac{1}{8} ÷ \frac{15}{2}=\frac{1}{60}$
$\frac{1}{8} × 8 ÷ \frac{1}{3}=3$
$\frac{6}{19} × \frac{1}{2}=\frac{3}{19}$
$0 ÷ \frac{21}{4}=0$
$\frac{1}{9} × 72 × \frac{13}{8}=13$
$70^2=4900$
$0.05^2=0.0025$
$200^2=40000$
（2）计算下列各题，能简算的要简算。
$\frac{9}{16} ÷ 3 ÷ \frac{3}{8}$
$\frac{5}{36} × 18 × \frac{6}{5}$
$\frac{7}{15} ÷ \frac{14}{25} ÷ \frac{14}{25}$
$\frac{11}{24} × 44 × \frac{3}{44}$
$\frac{7}{13} ÷ 7 + \frac{1}{7} × \frac{6}{13}$
$18 ÷ [ \frac{1}{3} + ( 1 - \frac{7}{12} ) ]$
$\frac{9}{16} ÷ 3 ÷ \frac{3}{8}$
$\frac{5}{36} × 18 × \frac{6}{5}$
$\frac{7}{15} ÷ \frac{14}{25} ÷ \frac{14}{25}$
$\frac{11}{24} × 44 × \frac{3}{44}$
$\frac{7}{13} ÷ 7 + \frac{1}{7} × \frac{6}{13}$
$18 ÷ [ \frac{1}{3} + ( 1 - \frac{7}{12} ) ]$
答案
$\frac{9}{16} ÷ 3 ÷ \frac{3}{8}$
$=\frac{9}{16}×\frac{1}{3}×\frac{8}{3}$
$=\frac{1}{2}$
$\frac{5}{36} × 18 × \frac{6}{5}$
$=(\frac{5}{36}×\frac{6}{5})×18$
$=\frac{1}{6}×18$
$=3$
$\frac{7}{15} ÷ \frac{14}{25} ÷ \frac{14}{25}$
$=\frac{7}{15}×\frac{25}{14}×\frac{25}{14}$
$=\frac{5}{6}×\frac{25}{14}$
$=\frac{125}{84}$
$\frac{11}{24} × 44 × \frac{3}{44}$
$=\frac{11}{24}×(44×\frac{3}{44})$
$=\frac{11}{24}×3$
$=\frac{11}{8}$
$\frac{7}{13} ÷ 7 + \frac{1}{7} × \frac{6}{13}$
$=\frac{7}{13}×\frac{1}{7}+\frac{1}{7}×\frac{6}{13}$
$=\frac{1}{7}×(\frac{7}{13}+\frac{6}{13})$
$=\frac{1}{7}×1$
$=\frac{1}{7}$
$18 ÷ [ \frac{1}{3} + ( 1 - \frac{7}{12} ) ]$
$=18÷[\frac{1}{3}+\frac{5}{12}]$
$=18÷\frac{3}{4}$
$=24$
$=\frac{9}{16}×\frac{1}{3}×\frac{8}{3}$
$=\frac{1}{2}$
$\frac{5}{36} × 18 × \frac{6}{5}$
$=(\frac{5}{36}×\frac{6}{5})×18$
$=\frac{1}{6}×18$
$=3$
$\frac{7}{15} ÷ \frac{14}{25} ÷ \frac{14}{25}$
$=\frac{7}{15}×\frac{25}{14}×\frac{25}{14}$
$=\frac{5}{6}×\frac{25}{14}$
$=\frac{125}{84}$
$\frac{11}{24} × 44 × \frac{3}{44}$
$=\frac{11}{24}×(44×\frac{3}{44})$
$=\frac{11}{24}×3$
$=\frac{11}{8}$
$\frac{7}{13} ÷ 7 + \frac{1}{7} × \frac{6}{13}$
$=\frac{7}{13}×\frac{1}{7}+\frac{1}{7}×\frac{6}{13}$
$=\frac{1}{7}×(\frac{7}{13}+\frac{6}{13})$
$=\frac{1}{7}×1$
$=\frac{1}{7}$
$18 ÷ [ \frac{1}{3} + ( 1 - \frac{7}{12} ) ]$
$=18÷[\frac{1}{3}+\frac{5}{12}]$
$=18÷\frac{3}{4}$
$=24$
（3）化简下列各比。
$\frac{3}{8}:\frac{5}{12}$ $\frac{81}{18}:81$ 14 cm : 35 dm 500 g : 1.5 kg
$\frac{3}{8}:\frac{5}{12}$ $\frac{81}{18}:81$ 14 cm : 35 dm 500 g : 1.5 kg
答案
$\frac{3}{8}:\frac{5}{12}$
$=(\frac{3}{8}×24):(\frac{5}{12}×24)$
$=9:10$
$\frac{81}{18}:81$
$=(\frac{81}{18}÷81):(81÷81)$
$=\frac{1}{18}:1$
$=1:18$
$14\ \mathrm{cm}:35\ \mathrm{dm}$
$=14\ \mathrm{cm}:350\ \mathrm{cm}$
$=(14÷14):(350÷14)$
$=1:25$
$500\ \mathrm{g}:1.5\ \mathrm{kg}$
$=500\ \mathrm{g}:1500\ \mathrm{g}$
$=(500÷500):(1500÷500)$
$=1:3$
$=(\frac{3}{8}×24):(\frac{5}{12}×24)$
$=9:10$
$\frac{81}{18}:81$
$=(\frac{81}{18}÷81):(81÷81)$
$=\frac{1}{18}:1$
$=1:18$
$14\ \mathrm{cm}:35\ \mathrm{dm}$
$=14\ \mathrm{cm}:350\ \mathrm{cm}$
$=(14÷14):(350÷14)$
$=1:25$
$500\ \mathrm{g}:1.5\ \mathrm{kg}$
$=500\ \mathrm{g}:1500\ \mathrm{g}$
$=(500÷500):(1500÷500)$
$=1:3$
