Question

9 КЛАСС
В геометрической прогрессии (bn) b4 = 1/16, b5 = 1/32. Найдите b2.

Answer 1

$b_5=b_1q^4=b_4q;\ \ q= dfrac{b_5}{b_4} =0.5\ \ \ b_4=b_1q^3=b_2q^2;~~~to~~~~ b_2= dfrac{b_4}{q^2} = dfrac{1/16}{1/4} =1/4$