Cách làm cho bạn:
| $\times $ | $\frac{2}{3}$ | $\frac{-4}{5}$ | $\frac{7}{12}$ | $\frac{-1}{20}$ |
| $\frac{2}{3}$ | $\frac{4}{9}$ | $\frac{-8}{15}$ | $\frac{7}{18}$ | $\frac{-1}{30}$ |
| $\frac{-4}{5}$ | $\frac{-8}{15}$ | $\frac{16}{25}$ | $\frac{-7}{15}$ | $\frac{1}{25}$ |
| $\frac{7}{12}$ | $\frac{7}{18}$ | $\frac{-7}{15}$ | $\frac{49}{144}$ | $\frac{-7}{240}$ |
| $\frac{-1}{20}$ | $\frac{-1}{30}$ | $\frac{1}{25}$ | $\frac{-7}{240}$ | $\frac{1}{400}$ |
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