Răspunsuri

2014-11-09T20:31:47+02:00
Ma =(a+b+c)/3
25=(a+b)/2
a=b/4
25=(b/4+b)/2
⇒(b+4b)/4·2=25
5b/8=25
b=25·8/5
b=40
a=b/4=40/4
a=10
Ma=(a+b+c)/3
25=(10+40+c)/3
(c+50)/3=25
c+50=3·25
c=75-50
c=25
verificare
Ma=(10+40+25)/3=75/3=25

2014-11-09T20:48:30+02:00