Question

A={x€Z / 6supra 2x- 1 €Z}
B={x€Z/ 4x-1 supra 2x+1 €Z}

Answer 1

2x-1 apartine lui D6. D6 = {1,2,3,6}
Punem bara si adunam 1 => 2x={2,3,4,7,0,-1,-2,-5} Punem bara si imaprtim la 2. => x = {1,2,-1}.

2x+1 divide 4x-1
2x+1 divide 2x+1 REZULTA DIN AMANDOUA : 2x+1 divide 8x-2
                                                                            2x+1 divide 8x+4
 => 2x+1 divide 2 => 2x+1 apartine lui D2. => D2 = {1,2,-1,-2} => 2x = {0,1,-2,-3} => x = {-1}.