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aflati media aritmetica a numerelor: 15 , 17 , 31
1/2 , 3/4 , 5/6


Răspuns :

(15+17+31):3=63:3=21
scuze doar atat stiu
m.a.=15+17+31/3=63/3=21

m.a.=1/2+3/4+5/6/3=6/12+9/12+10/12/3=25/12/3=25/12*1/3=25/36