Question

Va rog ex 3,plzz dau coroană

Answer 1

a) 4n /7 ≤14/15 <=> 15x4n ≤7x14 => 60n ≤ 98 => n ≤ 98/60 => n≤ 49/30 =>

(n∈N ) => n = {1}

b)2/5≤ 4/m <7/8 <=> 2/5 ≤ 4/m => 2m≤20 => m ≤ 10

4/m<7/8 => 7m>32 => m > 32/7 ; m∈(32/7 , 10] I m∈N =>

=> m = {5,6,7,8,9,10}