[tex] \frac{1}{3} [/tex] < [tex] \frac{2}{x-1} [/tex] < sau egal [tex] \frac{8}{3} [/tex]
[tex] \frac{1}{3} [/tex] < [tex] \frac{2}{x-1} [/tex]
x-1 > 2*3
x-1 > 6
x > 6+1
x > 7
x = (8,9,10................)
[tex] \frac{2}{x-1} [/tex] < sau egal [tex] \frac{8}{3} [/tex]
8(x-1) < sau egal 2*3
8x-8 < sau egal 6
8x < sau egal 6+8
8x < sau egal 14
x < sau egal 14 / 8
x < sau egal 1,6
x = (2,1,0)
