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Costelstochici
a fost răspuns

Cat face 1+2-3+4+5-6+7+8-9+....+2008+2009-2010+2011=

Răspuns :

2011*2012÷2-2*(3+6+9+...+2010) =2011*2012÷2-2*3*(1+2+3+...670) =2011*2012÷2-2*3*670*671÷2 =2011*1006-3*670*671=2011*1006-2010*671=2023066-1348710=674356

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