Вопрос школьника по предмету Алгебра
Выписаны первые несколько членов геометрической прогрессии: -25, -20, -16…
Найдите четвертый член.
Ответ учителя по предмету Алгебра
bn=b1*g^n-1
q=b2/b1=-20/-25=4/5
b4=b1*g^3
b4=-25*4/5^3=-25*64/125=-64/5=-12,8
Выписаны первые несколько членов геометрической прогрессии: -25, -20, -16…
Найдите четвертый член.
bn=b1*g^n-1
q=b2/b1=-20/-25=4/5
b4=b1*g^3
b4=-25*4/5^3=-25*64/125=-64/5=-12,8
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