Расчет Пирамиды. (Последовательность числовых прогрессий).

Расчет пирамиды.02.05.2001. Лицевая сторона: Суммы прогрессий:-1,-2,-3,-4,-5... 1,2,3,4,5... Выразим формулами:Sn= (n²a₁+n)/2, ; Sn-1=(n²a₁-n)/2,. (n - количество суммируемых членов, a₁ - первый член прогрессии. При отрицательном или положительном значении n. Выражения Sn-1, Sn-2 следует понимать: вычитание от номера взятого члена). Первый вариант: Пример:Sn= (n²a₁+n)/2. При n= -5 имеем: ((-5)2(-1)+(-5))/2=-15; При n= 5 имеем: (52*1+5)/2=15. Пример: Sn-1=(n²a₁-n)/2 При n= -5 имеем: ((-5)2(-1)-(-5))/2=-10 При n= 5 имеем: (52*1-5)/2=10. Трехгранная: Суммы прогрессий:-1,-3,-6,-10,-15....1,3,6,10,15.... Выразим формулами:Sn= ((n+a₁)3-(n+a₁))/6, Sn= (n3-n)/6+(n²a₁+n)/2; Sn-1=(n3-n)/6; Sn-2=((n-a₁)3-(n-a₁))/6, Sn-2=(n3-n)/6-(n²a₁-n ... Читать далее

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Сербиа Онлине · 626 days ago 0 333

The magnetic field of the neutral zone.

Calculation of the pyramid (Sequence of numerical progressions).

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Сербиа Онлине
Belgrade, Serbia

06.10.2024 (626 days ago)

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