`b)1 - 119/120 = 1/120 ; 1 - 118/119 = 1/119`
Mà `1/120 < 1/119` ( do `120 > 119` )
`=> 1 - 1/120 > 1 - 1/119`
`-> 119/120 > 118/119`
`a)222/555=(222:111)/(555:111)=2/5=2:5=0,4`
`333/444=(333:111)/(444:111)=3/4=3:4=0,75`
`0,4<0,75` nên :`2/5<3/4`
Vậy : `222/555<333/444`