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media aritmetica a numerelor a si b, unde a=1+2+3+....+30 si b=15 + 16 +17 +......+40 rste egala cu

Răspuns :

M= (a+b)/2 
a= 31*30:2=31*15=465
b=55*(40-14):2=55*26:2=55*13 =715
M=(465+715)/2=1180/2=590