X/14=-1/2 X/3=3/X X-7/12=-12/16 X/7=X+1/14

2 câu trả lời

`x/14 = -1/2`

`=> x = (-1).14 : 2 = -7`

Vậy `x = -7`

`...`

`x/3 = 3/x`

`=> x.x = 3.3`

`=> x^2 = 3^2`

`=> x = ±3`

Vậy `x = ±3`

`...`

`x - 7/12 = -12/16`

`=> x = -12/16 + 7/12`

`=> x = -1/6`

Vậy `x = -1/6`

`...`

`x/7 = x + 1/14`

`=> x/7 - x = 1/14`

`=> 1/7x - x = 1/14`

`=> x(1/7-1) = 1/14`

`=> x.(-6/7) = 1/14`

`=> x = 1/14 : (-6/7)`

`=> x = -1/12`

Vậy `x = -1/12`

`#dtkc`

 

`a)`

`x/14 = (-1)/2`

`=> x . 2 = 14 . -1`

`=> x . 2 = -14`

`=> x = -14 : 2`

`=> x = -7`

`Vậy: x = -7`

`b)`

`x/3 = 3/x`

`=> x . x = 3 . 3`

`=> x^2 = 9`

`=>` \(\left[ \begin{array}{l}x = 3\\x = -3\end{array} \right.\) 

`Vậy: x ∈ {3; -3}`

`c)`

`x - 7/12 = (-12)/16`

`x = (-12)/16 + 7/12`

`x = (-1)/6`

`d)`

`x/7 = x + 1/14`

`1/7x - x = 1/14`

`(1/7 - 1)x = 1/14`

`(-6)/7 x = 1/14`

`x = 1/14 : (-6)/7`

`x = (-1)/12`

`Vậy: x = (-1)/12`