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ex 5. Va rog repede!!

Ex 5 Va Rog Repede class=

Răspuns :

1/2+2/n+3/n+...+n/n=1/2+2/n+3/n+...n/n=n/3+2/1+...n/n=3/2+2/2+2/1...+n/n=2+2+2+..........+2=2•n=4