Предмет: Алгебра, автор: darkcokier

Допоможіть будь ласка!!!
1) Наступний член арифметичної прогресії
58; 56;...
2) Дана арифметична прогресія (an) Відомо що a1=6,8 і d=0,4 Обчисли суму перших семи членів арифметичної прогресії
3) Обчислити суму перших 10 членів арифметичної прогресії (an), якщо дані перші члени: 4; 13;
S10=
4) У геометричній прогресії 9; 36; 5-й член дорівнює
5) Дана геометрична прогресія -3 -9 Обчисли третій член послідовності: b3= Обчисли суму перших п'яти членів: S5=
6) Обчисли суми перших 6 членів геометричної прогресії, якщо b1=0,2 i q=3 S6=

Ответы

Автор ответа: vladkyrychenko2010

Ответ:

1) 54

2) S7 = 40.6

3) S10 = 85

4) 144

5) b3 = -27, S5 = -121.5

6) S6 = 155.2

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