Bài 8:

`a,` `{-13}/15 < {-12}/15 < {-11}/15 < -10/15`

`b,` `{-1}/3 < {-11}/36 < {-5}/18 < {-1}/4`

`c,` `4/{-10} > {5}/{-10} > 6/{-10} > 7/{-10}`

`d,` `{-1}/{-5} > {-1}/{-6} > {-1}/{-7} > 1/8`

Bài 9:

`a,` `{-9}/5 < 1/3`

`b,` `{-11}/4 < 5/{-7}`

`c,` `7/{-6} < 11/{-12}`

Bài 10:

`a,`

Có: `4444/5555 = 1 - 1111/5555` ; `6666/7777 = 1 - 1111/7777`

mà `1111/5555 > 1111/7777`

`=>` `4444/5555 < 6666/7777`

`b,`

 Có: `105/209 < 1` ; `2022/2021> 1`

`=>` `105/209 < 2022/2021`

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