Question

Aflati xEN astfel incat 3/5<7/x<15/11

Answer 1

aduci la acelasi numitor
3×11X<7×55<15×5X
3×11X<385
33X<385
X<385/33
X<35/3
X<11si2/3
7×55<15×5X
385<75X
75X>385
X>385/75
X>77/15
X>5si 2/15
X∈{6,7,8,9,10,11}