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Urgent!!!!!!!!!! Multumesc anticipat

Urgent Multumesc Anticipat class=

Răspuns :

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Vezi imaginea ELEEWELEEW
S1= 1-1/2 +1/2 - 1/3 + 1/4 - 1/5 +... +1/2012 -1/2013 = 1-1/2013 = 2012/2013