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`a) 0,(135)=0,135135...>0,135` (vì `0<1)`

`b) 0,(3)=0,3333..<0,345` (vì `3<4)`

`c)` Vì `45,678...<55,778..=>-45,678...> -55,778...`

`d)` Vì `6<7=>\sqrt{6}<\sqrt{7}`

`e) 43/20=2,15;2,1(467)=2,1467467...`

Vì `2,15>2,1467467...` (vì `5>4)`

`=>43/20>2,1(467)`

`f) 6/11=0,(54)=0,545454...<0,545545545...` (vì `4<5)`

`g) -2 2/9=-2,(2)=-2,222..`

Vì `2,222...>2,212212221` (vì `2>1)`

`=> -2,222...< -2,212212221`

`=> -2 2/9< -2,212212221`

`h) 7 8/13=7,(615384)>7,567567567...` (vì `6>5)`

`i) 1 7/33=1,(21)=1,212121...`

`k) 3,737373...<3,767676...` (vì `3<6)`

`l)` Vì `0,1855>0,184184...` (vì `5>4)=>-0,1855< -0,184184`

`m) 6,821821821...>6,8218` (vì `2>0)`

`n) 7,315315...<7,325316` (vì `2>1)`

`o) \sqrt{170}=13,038...>13` (vì `3>0)`