Va rooooog repedeeeeee

Răspuns:
15=3•5
18=2•3^2
cmmmc = 2•3^2 • 5=90
[(6-5)/90 • 45 + 1/60 • 60/(5-4)] • 2/3 =
(1/2 + 1) • 2/3 =
3/2 • 2/3 =
1