Răspunsuri

2014-10-04T22:12:56+03:00
=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
2 5 2
2014-10-04T22:18:31+03:00
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
2 4 2