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Afla suma fractiilor 1/30+2/30+3/30+4/30+5/30+...+30/30

Răspuns :

Adyella
S= n*(n+1): 2
S= 1/30+2/30+......30/30.....
s= 30*31: 2
s= 930: 2
s= 465
S= 465/30

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