Tìm x

A x+4/5=4/5+ (3/7+3/5)

B. 5/7+ x/35 =4/5

Answer`:`

`a)`

`x+4/5=4/5+ (3/7+3/5)`

`x+4/5=4/5+36/35`

`x+4/5=64/35`

`     x=64/35-4/5`

`     x=36/35`

Vậy `x=36/35`

`b)`

` 5/7+ x/35 =4/5`

`          x/35=4/5-5/7`

`          x/35=3/35`

`          x =3`

Vậy `x=3`

`#Boy`

a) `x + 4/5 = 4/5 + (3/7 + 3/5)`

`x = 4/5 + (3/7 + 3/5) - 4/5`

`x = (4/5 - 4/5) + (15/35 + 21/35)`

`x = 0 + 36/35`

`x = 36/35`

b) `5/7 + x/35 = 4/5`

`25/35 + x/35 = 28/35`

`25 + x = 28`

`x = 28 - 25`

`x = 3`

`\ttcolor{cyan}{@NeverGiveUp}`