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Care este suma 1/30+2/30+3/30+4/30+..........30/30=

Răspuns :

[tex] \frac{1+2+3+.....+30}{30} = [/tex]
facem sus suma Gauss adică 1+2+3+....+30= [tex] \frac{30*31}{2} [/tex]=465
apoi avem [tex] \frac{465}{30} =15,5[/tex]