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a fost răspuns

Cum se rezolva: 1+2-3+4+5-6+7+8-9+...+2008+2009-2010+2011

Răspuns :

Mikyella
=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
DeDeDeea
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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