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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Ale co w te kropki wstawić ?
1 = <+6> = 5
2 = <+ 7>= 3
I <+12 > = - 44
II <+ (-2)> = 54
DAJ NAJ