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Цифры: история появления и современность
108 days ago · From Наука 2.0.
Разница между числом и цифрой
111 days ago · From Наука 2.0.
Часто используемые числа
116 days ago · From Наука 2.0.
Суммы прогрессий: 1,2,3,4,5..., -1,-2,-3,-4,-5... Можно найти с помощью формулы:Sn= (n²a₁+n)/2. Суммы прогрессий: 1,3,6,10,15..., -1,-3,-6,-10,-15... Можно найти с помощью формулы:Sn= ((n+a₁)³-(n+a₁))/6. Суммы прогрессий: 1,4,9,16,25..., -1,-4,-9,-16,-25... Можно найти с помощью формулы:Sn= a₁(n+a₁)(n²a₁+0.5n)/3. (где n - количество суммируемых членов, a₁ -первый член прогрессии).
552 days ago · From Andrei Verner
Progress Sums: 1,2,3,4,5..., -1,-2,-3,-4,-5... It can be found using the formula: Sn=(n²a₁+n)/2. Progress Sum: 1,3,6,10,15..., -1,-3,-6,-10,-15... It can be found using the formula: Sn= ((n+a₁)³-(n+a₁))/6. Progress Sum: 1,4,9,16,25..., -1,-4,-9,-16,-25... It can be found using the formula: Sn= a₁(n+a₁)(n²a₁+0.5n)/3. (Where n - is the number of summable terms, a₁ - is the first term of the progression).
552 days ago · From Andrei Verner
О НЕКОТОРЫХ ОСОБЕННОСТЯХ СРЕДНЕВЕКОВЫХ ЕГИПЕТСКИХ И ИНЫХ ПОЛИТИКО-ДЕМОГРАФИЧЕСКИХ ЦИКЛОВ. СРАВНИТЕЛЬНЫЙ АНАЛИЗ
646 days ago · From Елена Федорова
 

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