Cách làm cho bạn:
- $\frac{1,27}{3,15} = \frac{127}{100}:\frac{315}{100} = \frac{127}{100}\times \frac{100}{315} = \frac{127}{215}$;
- $\frac{2}{3}:2\frac{2}{3} = \frac{2}{3}:\frac{8}{3} = \frac{2}{3}\times \frac{3}{8} = \frac{1}{4}$;
- $(-1\frac{4}{9}) : 2,14 = \frac{-13}{9}:\frac{214}{100} = \frac{-13}{9}\times \frac{100}{214} = \frac{-1300}{1953}$;
- $\frac{2\frac{1}{3}}{3\frac{1}{4}} = frac{\frac{7}{3}}{\frac{13}{4}} = \frac{7}{3}\times \frac{4}{13} = \frac{28}{39}$.
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