Question

Fie multimile A={x apartine nr naturale x este cifra impara}
b)B={x apartine nr.naturale |2x -1}
c) {x apartine nr .naturale |2x²+1≤19}
a.Enumerati elementele multimilor A,B,C

Answer 1

A= {1,3,5,7,9}

2x²+1≤19
2x² ≤19-1
2x² ≤ 18
x ²≤ 18:2
x² ≤ 9
C={0,1,2,3}