Question

Determinati elementele multimilor:
A={x apartine N* |x+3| 36};
B={x apartine N*|2x+1| 45};
C={x apartine N |x mai mic sau egal cu 27;8|x+5};
D={x apartine N |15 pe2x+1 apartine N};
E={x apartine Z |21 pe 2x+3 apatine Z};
F={x apartine N | 3x+9 pe x+1 apartine N};
G={x apartine Z \ {-2} | 3x+11 pe x+2 apartine Z}
H={x apartine Z | 3x+9 pe 2x-3 apartine Z}

Answer 1

C={x apartine N |x mai mic sau egal cu 27;8|x+5}

x ≤ 27 |+5 ⇒ x+5 ≤ 32

8| x+5 ⇒ x+5 ∈{8, 16, 24, 32}|-5 ⇒ x∈ {3, 11, 19, 27}