Question

QT dấu ngoặc, QT chuyển vế - Tìm x:

1/ 3/10x - 1 1/2 = (-2/7) : 5/14 

2/ 3/4 - (x-2/3) = 1 1/3

3/ 2/9 : x + 5/6 = 0.5 

Ghi chú: 1 1/2 = hỗn số 

Cảm ơn đã giúp  

Answer 1

`a) 3/10x - 1 1/2 = (-2/7) : 5/14 `

`=> 3/10x - 3/2 = (-2/7) * 14/5 = -4/5`

`=> 3/10x= -4/5 + 3/2 = -8/10 + 15/10`

`3/10x = 7/10`

`=> x = 7/10 : 3/10 =7/10 * 10/3`

`x = 7/3`

Vậy `x=7/3`

`3/4 - (x-2/3) = 1 1/3`

`=> 3/4 -x +2/3 = 4/3`

`=>3/4 -x = 4/3 -2/3 = 2/3 `

`=> x = 3/4 -2/3 =1/12`

Vậy `x=1/12`

`2/9 : x + 5/6 = 0,5 `

`=> 2/9:x = 0,5 - 5/6 = 3/6-5/6`

`=> 2/9:x = -2/6 = -1/3`

`=> x= 2/9 : (-1/3) = -2/3`

Vậy `x=-2/3`