Question

Прошу о помощи! ГИА, №21 Сократите дробь

Answer 1

$\frac{3^{2n-3} * 5^{n+1} }{45^{n-2} } = \frac{3^{2n-3} * 5^{n+1} }{15^{n-2} * 3^{n-2} } = \frac{3^{2n-3} * 5^{n+1} }{5^{n-2} * 3^{n-2} * 3^{n-2} } = \frac{3^{2n-3} * 5^{n+1} }{3^{2n-4} * 5^{n-2} } = 3 * 5^{3} = 375$