Предмет: Алгебра, автор: aliexxandrovna

Помогите пожалуйста ,заранее благодарю
1)определите номер n, если для геометрической прогрессии известно q=1/2,b1=128 bn=1
2)найти знаменатель геометрической прогрессии (Bn), если B6=25; B8=9

Ответы

Автор ответа: 99Алёна

2)b[7]=b[6]q

b[8]=b[7]q=b[6]q^2

9=25q^2

q^2=9/25

q=3/5 или q=-3/5

q=0.6 или q=-0.6

Автор ответа: aliexxandrovna

ну это я тоже нашла

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