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Cel mai inteligent răspuns!
2014-05-13T22:51:04+03:00
A)a=2b/5
c=7b/10

2b/5 + b+ 7b/10=210  aducem la acelasi numitor
4b+10b+7b=2 100
21b=2 100
b=100
a=2*100/5= 2*20=40
c=7*100/10= 7*10=70

b)ma= (a+b+c)/3=  (100+40+70)/3= 210/3= 70
p/100 =140/70
p=100*140/70
p=100*2=200%
Multumesc! ;)
n-ai pentru ce ;)