Вычислите способом, который использовал Гаусс при сложении:
1) -1-2-3-4-5-6-7-8-9-10-11;
2) 1 × (-2)+2 × (-2)+3 × (-2)+4 × (-2)+5 × (-2)+6 × (-2);
3) 6 : (-3)+9 : (-3)+12 : (-3)+15 : (-3)+18 : (-3)+ 21 : (-3).
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