Question

Determina elementele multimii A={2x + 1/x apartine N si x este divizor al lui 10}. Va rog repede!

Answer 1

2x+1
x|10=>x apartine multimii {1;2;5;10}
daca x=1
2×1+1=3
daca x=2
2×2+1=5
daca x=5
2×5+1=11
daca x=10
2×10+1=21
A={3;5;11;21}