`cccolor{#8FBC8F}{~} cccolor{#C1FFC1}{b} cccolor{#B4EEB4}{u} cccolor{#9BCD9B}{i} cccolor{#698B69}{g} cccolor{#2E8B57}{i} cccolor{#54FF9F}{a} cccolor{#4EEE94}{p} cccolor{#43CD80}{h} cccolor{#98FB98}{o} cccolor{#008B45}{n} cccolor{#00FF00}{g} cccolor{#00EE00}{9} cccolor{#00CD00}{9} cccolor{#ADFF2F}{9} cccolor{#228B22}{~}`

`1) (4/5+1/2).(3/15-8/13)`

`= (8/10+5/10).(39/195-120/195)`

`= 13/10 . (-81)/195`

`= 13/10 . (-27)/65`

`= -27/50`

`2) (-3/4+7/3) : (2/9-5/2)`

`= (-9/12+28/12):(4/18-45/18)`

`= 19/12:(-41)/18`

`= 19/12 . (-18)/41`

`= -57/82`

`3) 3/4 . [1/5-(4/7+3/5:(-7)/5)]`

`= 3/4 . [1/5-(4/7-3/5 . 5/7)]`

`= 3/4 . [1/5-(4/7-3/7)]`

`= 3/4 . [1/5-1/7]`

`= 3/4 . [7/35-5/35]`

`= 3/4 . 2/35`

`= 3/70`

`4) (67/111+2/33-15/117).(1/3-1/4-1/12)`

`= (67/111+2/33-15/117).(4/12-3/12-1/12)`

`= (67/111+2/33-15/117) . 0`

`= 0`

`5) (4/3+8/3).(7/4-6/4):(7/5+12/5)`

`= 12/3 . 1/4 : 19/5`

`= 4 . 1/4 : 19/5`

`= 1 : 19/5`

`= 5/19`

$\color{#29B6F6}{\heartsuit Phuongg \ Li nhh \heartsuit}$