`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}{~}`

`a) x+2/3=5/4`

`x=5/4-2/3`

`x=(5.3)/(4.3)-(2.4)/(3.4)`

`x=15/12-8/12`

`x=(15-8)/12`

`x=7/12`

Vậy `x=7/12`

`b) (x+3/10) . 1/2 = 17/12`

`x+3/10=17/12 : 1/2`

`x+3/10=17/12 . 2`

`x+3/10=(17.2)/12`

`x+3/10=34/12`

`x+3/10=(34:2)/(12:2)`

`x+3/10=17/6`

`x=17/6-3/10`

`x=(17.5)/(6.5)-(3.3)/(3.10)`

`x=85/30-9/30`

`x=(85-9)/30`

`x=76/30`

`x=(76:2)/(30:2)`

`x=38/15`

Vậy `x=38/15`

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