Предмет: Математика, автор: Ирина1507

Помогите!1+2+3+...+100=?

Ответы

Автор ответа: vvkh

это арифметическая прогрессия с 1-м членом=1, последним =100, всего элементов -100, и шагом 1

ее сумма=((1+100)/2)*100=5050

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