Предмет: Математика, автор: dimamasik

Выписано несколько последовательных членов арифметической прогрессии: 8;х;16;20;......... Найдите Х .

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Автор ответа: wejde

0

Пусть a₂=8, a₃=x, a₄=16, a₅=20
Тогда: d=a₅-a₄=20-16=4
Значит: a₃=a₂+d=8+4=12
Ответ: x=12

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