September 2018 1 25 Report

Ile to jest?

a) (-1)+2+(-3)+4+(-5)+...+(-19)+20

b) 1-2+3-4+5-6+...+49-50

Oblicz jak najkrócej, która suma jest większa i o ile?

I (-2)+4+(-6)+8+(-10)+...+(-50)

II 2+(-4)+6+(-8)+10+...+50


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