Question

tìm x

7²-7:(13-X)=14

Answer 1

`7^2 - 7 : (13-x)=14`

`49-7:(13-x)=14`

`7:(13-x)=49-14`

`7:(13-x)=35`

`13-x=7 : 35`

`13-x=0,2`

`x=13-0,2`

`x=12,8`

Vậy `x = 12,8`

Answer 2

`7^2-7:(13-x)=14`

`49-7:(13-x)=14`

`7:(13-x)=49-14`

`7:(13-x)=35`

`13-x=7:35`

`13-x=0,2`

`x=13-0,2`

`x=12,8`