Question

fractii:
afla pe z astfel incat :
4/10≤z/10≤7/10;
7/5≤7/z≤7/5;
4/18≤2z/18≤10/18

Answer 1

a)
4/10  ≤  z/10  ≤  7/10;
4 ≤ z ≤ 7
z ∈ {4; 5; 6; 7}

b)
7/5  ≤  7/z  ≤  7/5;
5 ≥ z ≥ 5
=> z = 5

c)
4/18 ≤ 2z/18 ≤ 10/18
4  ≤  2z  ≤  10
2  ≤  z  ≤  5
z ∈ {2; 3; 4; 5}