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2014-11-15T20:01:43+02:00
(a+b+c)/3=21
(a+b)/2=25=>a+b=2*25=50
c=2b-7
(50+2b-7)/3=21
50+2b-7=21*3
50+2b-7=63
2b=63-50+7
2b=20
b=20:2
b=10
(a+10)/2=25
a+10=50
a=50-10
a=40
c=20-7
c=13
Dem:(40+10+13)/3=63/3=21


2 4 2
2014-11-15T20:03:13+02:00
A+b+c/3=21 a+b+c=62 a+b=25 a+b=50 c=2a-7 c=62-50=12 2a=12+7=19 a=9,5 b=63-(12+9,5)=41,5