$ \begin{array} { l } { \frac { 1 } { 2 } ÷ 3 = \frac { 1 } { 2 } × () } \\ { \frac { 2 } { 1 5 } ÷ 2 = \frac { 2 } { 1 5 } × () } \\ { \frac { 1 0 } { 1 1 } ÷ 1 0 = \frac { 1 0 } { 1 1 } × () } \\ { \frac { 2 } { 3 } ÷ \frac { 3 } { 2 } = \frac { 2 } { 3 } × () } \\ { 1 6 ÷ \frac { 4 } { 5 } = 1 6 × () } \\ { 0. 8 ÷ \frac { 4 } { 9 } = 0. 8 × () } \\ { \frac { 2 0 } { 2 1 } ÷ \frac { 5 } { 7 } = \frac { 2 0 } { 2 1 } × () } \\ { \frac { 5 } { 1 7 } ÷ 5 = \frac { 5 } { 1 7 } × () } \\ { 2 ÷ 0. 6 = 2 × () } \\ { \frac { 7 } { 6 0 } ÷ 1 = \frac { 7 } { 6 0 } × () } \\ { \frac { 9 } { 5 0 } ÷ 9 = \frac { 9 } { 5 0 } × () } \\ { 1 ÷ 0. 1 = 1 × () } \end{array} $
答案:
$\frac{1}{3}$,$\frac{1}{2}$,$\frac{1}{10}$,$\frac{2}{3}$,$\frac{5}{4}$,$\frac{9}{4}$,$\frac{7}{5}$,$\frac{1}{5}$,$\frac{5}{3}$,1,$\frac{1}{9}$,10
$ \begin{array} { l } { \frac { 3 } { 7 } ÷ \frac { 7 } { 3 } = } \\ { \frac { 3 } { 4 } ÷ \frac { 1 } { 9 } = } \\ { 0. 9 ÷ \frac { 3 } { 2 } = } \\ { \frac { 5 } { 2 } ÷ \frac { 5 } { 2 } = } \\ { 0. 1 ÷ \frac { 6 } { 5 } = } \\ { 1 0 ÷ \frac { 5 } { 6 } = } \\ { \frac { 2 } { 9 } ÷ \frac { 9 } { 2 } = } \\ { 1 ÷ \frac { 5 } { 2 } = } \\ { \frac { 3 } { 8 } ÷ \frac { 3 } { 4 } = } \\ { 9 × \frac { 2 } { 3 } = } \\ { \frac { 5 } { 6 } ÷ 1 0 = } \end{array} $
答案:
1. $\frac{3}{7} ÷ \frac{7}{3} = \frac{3}{7} × \frac{3}{7} = \frac{9}{49}$
2. $\frac{3}{4} ÷ \frac{1}{9} = \frac{3}{4} × 9 = \frac{27}{4}$
3. $0.9 ÷ \frac{3}{2} = \frac{9}{10} × \frac{2}{3} = \frac{3}{5} = 0.6$
4. $\frac{5}{2} ÷ \frac{5}{2} = \frac{5}{2} × \frac{2}{5} = 1$
5. $0.1 ÷ \frac{6}{5} = \frac{1}{10} × \frac{5}{6} = \frac{1}{12}$
6. $10 ÷ \frac{5}{6} = 10 × \frac{6}{5} = 12$
7. $\frac{2}{9} ÷ \frac{9}{2} = \frac{2}{9} × \frac{2}{9} = \frac{4}{81}$
8. $1 ÷ \frac{5}{2} = 1 × \frac{2}{5} = \frac{2}{5}$
9. $\frac{3}{8} ÷ \frac{3}{4} = \frac{3}{8} × \frac{4}{3} = \frac{1}{2}$
10. $9 × \frac{2}{3} = 6$
11. $\frac{5}{6} ÷ 10 = \frac{5}{6} × \frac{1}{10} = \frac{1}{12}$
2. $\frac{3}{4} ÷ \frac{1}{9} = \frac{3}{4} × 9 = \frac{27}{4}$
3. $0.9 ÷ \frac{3}{2} = \frac{9}{10} × \frac{2}{3} = \frac{3}{5} = 0.6$
4. $\frac{5}{2} ÷ \frac{5}{2} = \frac{5}{2} × \frac{2}{5} = 1$
5. $0.1 ÷ \frac{6}{5} = \frac{1}{10} × \frac{5}{6} = \frac{1}{12}$
6. $10 ÷ \frac{5}{6} = 10 × \frac{6}{5} = 12$
7. $\frac{2}{9} ÷ \frac{9}{2} = \frac{2}{9} × \frac{2}{9} = \frac{4}{81}$
8. $1 ÷ \frac{5}{2} = 1 × \frac{2}{5} = \frac{2}{5}$
9. $\frac{3}{8} ÷ \frac{3}{4} = \frac{3}{8} × \frac{4}{3} = \frac{1}{2}$
10. $9 × \frac{2}{3} = 6$
11. $\frac{5}{6} ÷ 10 = \frac{5}{6} × \frac{1}{10} = \frac{1}{12}$
$ \begin{array} { l } { 1 0 ÷ \frac { 1 } { 2 } = } \\ { \frac { 3 } { 1 0 } ÷ \frac { 3 } { 5 } = } \\ { 7 ÷ \frac { 7 } { 2 } = } \\ { 1 4 ÷ \frac { 7 } { 8 } = } \\ { \frac { 7 } { 9 } ÷ \frac { 1 4 } { 1 5 } = } \\ { \frac { 7 } { 2 0 } ÷ \frac { 7 } { 1 0 } = } \\ { 2. 5 ÷ \frac { 2 5 } { 4 } = } \\ { \frac { 1 } { 6 } ÷ \frac { 5 } { 1 8 } = } \\ { \frac { 2 } { 1 5 } ÷ \frac { 8 } { 4 5 } = } \\ { 1 ÷ \frac { 7 } { 9 } = } \\ { 0 ÷ \frac { 9 9 } { 1 0 0 } = } \end{array} $
答案:
1. $10÷\frac{1}{2}=10×2=20$
2. $\frac{3}{10}÷\frac{3}{5}=\frac{3}{10}×\frac{5}{3}=\frac{1}{2}$
3. $7÷\frac{7}{2}=7×\frac{2}{7}=2$
4. $14÷\frac{7}{8}=14×\frac{8}{7}=16$
5. $\frac{7}{9}÷\frac{14}{15}=\frac{7}{9}×\frac{15}{14}=\frac{5}{6}$
6. $\frac{7}{20}÷\frac{7}{10}=\frac{7}{20}×\frac{10}{7}=\frac{1}{2}$
7. $2.5÷\frac{25}{4}=\frac{5}{2}×\frac{4}{25}=\frac{2}{5}$
8. $\frac{1}{6}÷\frac{5}{18}=\frac{1}{6}×\frac{18}{5}=\frac{3}{5}$
9. $\frac{2}{15}÷\frac{8}{45}=\frac{2}{15}×\frac{45}{8}=\frac{3}{4}$
10. $1÷\frac{7}{9}=1×\frac{9}{7}=\frac{9}{7}$
11. $0÷\frac{99}{100}=0$
2. $\frac{3}{10}÷\frac{3}{5}=\frac{3}{10}×\frac{5}{3}=\frac{1}{2}$
3. $7÷\frac{7}{2}=7×\frac{2}{7}=2$
4. $14÷\frac{7}{8}=14×\frac{8}{7}=16$
5. $\frac{7}{9}÷\frac{14}{15}=\frac{7}{9}×\frac{15}{14}=\frac{5}{6}$
6. $\frac{7}{20}÷\frac{7}{10}=\frac{7}{20}×\frac{10}{7}=\frac{1}{2}$
7. $2.5÷\frac{25}{4}=\frac{5}{2}×\frac{4}{25}=\frac{2}{5}$
8. $\frac{1}{6}÷\frac{5}{18}=\frac{1}{6}×\frac{18}{5}=\frac{3}{5}$
9. $\frac{2}{15}÷\frac{8}{45}=\frac{2}{15}×\frac{45}{8}=\frac{3}{4}$
10. $1÷\frac{7}{9}=1×\frac{9}{7}=\frac{9}{7}$
11. $0÷\frac{99}{100}=0$
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