Question

Помните пожалуйста 15 балов

Answer 1

$b _{1} = \frac{1}{125} \\ q = 5 \\ b _{n} = b _{1}q {}^{n - 1} \\ b _{4} = b _{1}q {}^{3} = \frac{1}{125} \times 5 {}^{3} = \frac{125}{125} = 1 \\ b _{7} = b _{1}q {}^{6} = \frac{1}{125} \times 5 {}^{6} = \\ \frac{5 {}^{6} }{5 {}^{3} } = 5 {}^{3} = 125$