Question

tim so tu nhien x biet 7 chia het cho 3x tru 2

 

Answer 1

Để \(7⋮\left(3x-2\right)\)thì \(\left(3x-2\right)\inƯ\left(7\right)\)

\(Ư\left(7\right)=\left\{\pm1,\pm7\right\}\)

Xét từng TH:

_ 3x - 2 = -1 => x = 1/3 (tm)

_ 3x - 2 = 1 => x = 1 (tm)

_ 3x - 2 = - 7 => x = -5/3 (ko tm)

_ 3x - 2 = 7 => x = 3 (tm)

Vậy: \(x\in\left\{\frac{1}{3},1,3\right\}\)

=.= hok tốt!!