Question

aflari numerele naturale nenule n astfel incat 9/5<n/5<13/5
B) 4/11 <4/n<4/3

Answer 1

9/5<n/5/13/5
9<n<13 ⇒n∈{10,11,12}
b)
4/11<4/n<4/3
4/11<4/n⇒4n<44 ⇒n<11
4/n<4/3 ⇒4n>12 ⇒n>3
n∈{4,5,6,7,8,9,10}