Đáp án + giải thích bước giải :
`1) 1/4 + 3/4x = 1/2`
`-> 3/4x = 1/2 - 1/4`
`-> 3/4x = 1/4`
`-> x = 1/4 : 3/4`
`-> x = 1/3`
Vậy `x = 13`
`2) x/5 + x/10 = 2/5`
`->x . (1/5 + 1/10) = 2/5`
`-> x . 3/10 = 2/5`
`-> x = 2/5 : 3/10`
`-> x = 4/3`
Vậy `x = 4/3`
`3) x - 2/3 = 5/7`
`-> x = 5/7 + 2/3`
`-> x = 29/21`
Vậy `x = 29/21`
`4) 2x - 1/6 = x - 3/2`
`-> 2x - x = 1/6 - 3/2`
`-> (2 - 1)x = (-4)/3`
`-> x = (-4)/3`
Vậy `x = (-4)/3`
`5) (75%x - 2/3) = 1/6`
`-> 3/4x = 1/6 + 2/3`
`-> 3/4x = 5/6`
`-> x = 5/6 : 3/4`
`-> x = 10/9`
Vậy `x = 10/9`
