(1/6+1/10+1/15):(3/5-1/3-1/4)
=20
=
= =
= = 2
Ответ: 2
20*
(1/6+1/10+1/15):(3/5-1/3-1/4)=20/60 : 1/60= 20/60 : 60/1=20