Предмет: Математика, автор: 435726

найдите сумму натуральных чисел по методу гауса а) от11 до20 б)от21 до30 в)от 51 до 70

Ответы

Автор ответа: Dan2407

0

а) от 11 до 20
(11+20)*5=31*5=155 (5 пар)
б) от 21 до 30
(21+30)*5=51*5=255 (5 пар)
в) от 51 до 70
(51+70)*10=121*10=1210 (10 пар)

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