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Ma puteti ajuta la acest exericitiu??!? dau 30 de puncte (14+15+...+25)-(11+12+...+20)

Răspuns :

(14+15+.....+25)-(11+12+...+20)

=(14-14)+(15-15)+..+(20-20) +(21-11)+(22-12)+(23-13)+24+25 = 30+49 = 79