độc lạ sahara 

`24,3-y:16-3,4=30,34`

`=>24,3-y:16=30,34+3,4`

`=>24,3-y:16=33,74`

`=>y:16=24,3-33,74`

`=>y:16=-9,44`

`=>y=-9,44xx16`

`=>y=-151,04`

`13,25 : 0,5 + 13,25 : 0,2 + 13,25 : 0,25`

`= 13,25 : 1/2 + 13,25 : 1/5 + 13,25 : 1/4`

`= 13,25 xx 2 + 13,25 xx 5 + 13,25 xx 4`

`= 13,25 xx ( 2 + 5 + 4)`

`= 13,25 xx 11`

`= 145,75`

`1 1/3 + 1 1/5 xx y - 4/5 = 2 4/5`

`=> 4/3 + 6/5 xx y = 14/5 + 4/5`

`=> 4/3 + 6/5 xx y = 18/5`

`=> 6/5 xx y = 18/5 - 4/3`

`=> 6/5 xx y = 54/15 - 20/15`

`=> 6/5 xx y = 34/15`

`=> y = 34/15 : 6/5`

`=> y = 34/15 xx 5/6`

`=> y = 34/18`

`=> y = 17/9`

Vậy `y=17/9`

`#QiN`

cậu check lại bước 2 nhé.