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Ma=(a+b+c):3. Ma=12 Ma=(a+b):2=ma=10

Răspuns :

M_a=(a+b):2<=>10=(a+b):2=>a+b=20 si =>M_a=(a+b+c):3<=>12=(20+c):3=>20+c=36=>c=36-20=>c=16
a+b+c=12x3=36
a+b=10x2=20
c=32-20=12