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2014-07-17T10:40:52+03:00
M.A  a,b,c =20
m.a =  \frac{suma}{3} deci suma = M.A x 3

suma=20x3
suma celor 3 numere este 60.

media aritmetica a si b=25
a+b= 25x2
a+b=50

60-50=10(c)
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2014-07-17T10:44:33+03:00
(a+b+c):3=20⇒a+b+c=3·20+60
(a+b):2=25⇒a+b=2·25+50
⇒c=(a+b+c)-(a=b)
⇒c=60-50=10

Verificare:(a+b+c):3=(50+10):3=60:3=20
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