Đáp án:

Giải thích các bước giải:

 Câu `3`

`c`

`5/6 : 1/6 : (3x-1) =-2/18`

`1/6 :(3x-1) = -2/18 -5/6`

`1/6 : (3x-1) = -2/18 - 15/18`

`1/6:(3x-1)=(-17)/18`

`3x-1=1/6 : (-17)/18`

`3x-1=-3/17`

`3x=-3/17+1`

`3x=14/17`

`x=14/17 :3`

`x=14/51`

Vậy ` x=14/51`

`d`

`1/3 (4x-1) +50% = (-7)/6`

`1/3(4x-1) +1/2 =-7/6`

`1/3 (4x-1) =-7/6 - 1/2`

`1/3(4x-1) = -7/6 - 3/6`

`1/3(4x-1) = (-5)/3`

`4x-1=(-5)/3 :1/3`

`4x-1=-5`

`4x=-5+1`

`4x=-4`

`x=-4:4`

`x=-1`

Vậy `x=-1`