<span>Первый член прогрессии: A1 = -0.25Найдем n-ый член прогрессии: An = A1·q<span> n - 1</span>A7 = (-0.25)·(2)7-1 = -16Сумма первых n членов прогрессии: Sn = A1·(qn- 1)/(q - 1)S7 = -0.25·(27- 1)/(2 - 1) = -31.75<span>Первые 10 членов прогрессии: </span>A1 = -0.25A2 = A1·q = -0.5A3 = A1·q2 = -1A4 = A1·q3 = -2A5 = A1·q4 = -4A6 = A1·q5 = -8A7 = A1·q6 = -16</span>