Question

scrieti elementele multimii M
M=(x∈N l$\frac{10}{2x+1}$∈N)

Answer 1

$\frac{10}{2x+1}$ , 2x+1∈{1,2,5,10}
1)2x+1=1
2x=0
x=0∈N
2)2x+1=2
2x=1
x=0,5∉N
3)2x+1=5
2x=4
x=2∈N
4)2x+1=10
2x=9
x=4,5∉N
Prin urmare M={0,2}.