Guips mk vs ạ >3<>3<(　＾＾)(　＾＾)

Đáp án:

`a)` `x=13/8`

`b)` `x=27/2`

`c)` `x=-87/140`

Giải thích các bước giải:

`a)` `(3(1)/(4) : x). (-1(1)/(4)) = -5/3-5/6`

`=> (13/4 : x). (-5/4) = -10/6-5/6`

`=> (13/4 : x). (-5/4) = -15/6`

`=> 13/4 : x = (-5/2) : (-5/4)`

`=> 13/4 : x = (-5/2). (-4/5)`

`=> 13/4 : x = 2`

`=> x = 13/4 : 2`

`=> x = 13/4. 1/2`

`=> x = 13/8`

Vậy `x=13/8`

`b)` `-1/4-3/4 : x = -11/36`

`=> 3/4 : x = -1/4-(-11/36)`

`=> 3/4 : x = -1/4+11/36`

`=> 3/4 : x = -9/36+11/36`

`=> 3/4 : x = 2/36`

`=> x = 3/4 : 1/18`

`=> x= 3/4. 18`

`=> x = 27/2`

Vậy `x=27/2`

`c)` `5/7+2/3x = 3/10`

`=> 2/3x = 3/10-5/7`

`=> 2/3x = 21/70-50/70`

`=> 2/3x = -29/70`

`=> x = -29/70 : 2/3`

`=> x = -29/70. 3/2`

`=> x = -87/140`

Vậy `x=-87/140`