Предмет: Алгебра, автор: вафелька1214

выписаны первые несколько членов геометрической прогрессии: -25, -20, -16.. Найдите её четвёртый член

Ответы

Автор ответа: Mike1739
0
1.Найдем q по формуле: q=b1/b2
2. b1= -25 b2=-20 b3=-16
3. q=b1/b2=-25/-20=1,25 => b4=-16/1,25=-12,8
Ответ; b4=-12,8
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