Oblicz Sprytnie: (-1)+(-2)+(-3)+(-4)+(-5)+5+4+3+2+1=?
(-6)+(-7)+(-8)+(-9)+16+17+18+19=?
(-1)+2+(-3)+4+(-5)+6+(-7)+8+(-9)+10=?
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2) =(-30)+70=40
3)=(-25)+30=5. trzeba policzyć sprytnie ;p czyli minusy dodajesz do minusow a plusy do plusów