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`