Вопрос школьника по предмету Алгебра
найдите третий член геомтерической прогресси если b5=1 b8=8
Ответ учителя по предмету Алгебра
b8=b1*q^7
b5=b1*q^4
b1*q^7=8
b1*q^4=1
Разделим первое уравнение на второе:
q^3=8
q=2
b1=1/q^4=1/16
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