Question

Determinati numerele intregi x pentru care fractia 6$\frac{6}{2x-1}$ este numar intreg

Answer 1

2x-1 / 6
2x-1 apartine {+1, -1,+6,-6,+2,-2,+3,-3} adun 1
2x apartine {+2, 0,+7,-5,+3,-1,+4,-2} impart la 2
x apartine {+1,0,+2,-1}