Tính a ) 3 2/5 ± 2 5/7 = b ) 5 1/3 – 4 5/6 = c ) 2 3/8 ± 3 – 4 1/6 = Chú ý : dấu ± là cộng 3 2/5 , 2 5/7 , 5 1/3 , 4 5/6 , 2 3/

$\text{@Chiii S A D}$

$a)$ $3$ `2/5` $+$ $2$ `5/7`

$=$ `17/5` $+$ `19/7`

$=$ `119/35` $+$ `95/35`

$=$ `214/35`

$b)$ $5$ `1/3` $-$ $4$ `5/6`

$=$ `16/3` $-$ `29/6` 

$=$ `96/18` $-$ `87/18`

$=$ `9/18`

Rút gọn $=$ `1/2`

$c)$ $2$ `3/8` $+$ $3$ $-$ $4$ `1/6`

$=$ $2$ `3/8` $+$ `3/1` $-$ `25/6` 

$=$ `19/8` $+$ `24/8` $-$ `25/6`

$=$ `43/8` $-$ `25/6` 

$=$ `258/48` $-$ `200/48`

$=$ `58/48`

Xin hay nhất nè !