Question

ДАЮ МНОГО БАЛЛОВ!!!!!
делать с 1 по 3 задания..
желательно с фото черновика

Answer 1

1) 2; 3
2) 
$a_1 = 2, \ q = 3 \\ a_n = a_1 *q^{n-1} \\ a_4 = a_1 * q^{4-1} = 2 * 3^3 = 2 * 27 = 54$

3)
$a_3 = 3, \ a_5 = 75 \\ a_n = a_1 * q^{n-1} \\\\ \left \{ {{a_1 * q^2 = 3} \atop {a_1 * q^4 = 75}} \right. \\\\ \frac{a_1 * q^4}{a_1 * q^2} = \frac{75}{3} \\\\ q^2 = 25 \\ q = 5$