Răspunsuri

2014-02-28T16:10:43+02:00
A/b=4
a-b=18

a/b=4 => a=4b
4b-b=18
3b=18
b=18:3
b=6

a-6=18
a=18+6
a=24

media aritmetica
(a+b)/2=
=(6+24)/2=
=30/2
=15