Đáp án:
a)
`\frac{1}{3} = \frac{1.2}{3.2} = \frac{2}{6}`
Vì `\frac{2}{6} < \frac{5}{6}` nên `\frac{1}{3} < \frac{5}{6}`.
b)
`\frac{4}{5} = \frac{4.7}{5.7} = \frac{28}{35}`
`\frac{3}{7} = \frac{3.4}{7.5} = \frac{12}{35}`
Vì `\frac{28}{35} > \frac{12}{35}` nên `\frac{4}{5} = \frac{3}{7}`.
c)
`\frac{-3}{11} = \frac{-3.13}{11.13} = \frac{-39}{143}`
`\frac{-4}{13} = \frac{-4.11}{13.11} = \frac{-44}{143}`
Vì `\frac{-39}{143} > \frac{-44}{143}` nên `\frac{-3}{11} > \frac{-4}{13}`.
d)
`\frac{63}{-70} = \frac{-63}{70} = \frac{-9}{10} = \frac{-27}{30}`
`\frac{-5}{6} = \frac{-5.5}{6.5} = \frac{-25}{30}`
Vậy `\frac{-27}{30} < \frac{-25}{30}` nên `\frac{63}{-70} < \frac{-5}{6}`.
Chúc học tốt!!!
