Question

1. Aflati numerele a si b stiind ca (a,b) = 5 si [a. b] = 15.

2. Determinati multimea: A={ x apartine Z | 2x+3 supra x+1 apartine Z}. ​

Answer 1

(a, b) * [a, b] = 5*15= 75

Pt a = 5

b= 15

2. 2x+3/ x+1 €Z

x+1/x+1

x+1 / 2x+3 - 2(x+1)

x+1/ 1

x+1 €D1

D1 ={ -1 , 1}

x+1= -1

x= -2

x+1= 1

x= 0

A={0, -2}