Предмет: Математика, автор: valiabilalova

Обчисли суми перших 5 членів геометричної прогресії, якщо b1= -0,7 і знаменник дорівнює 4.
S5=​

Ответы

Автор ответа: spaashyitort57
0

Для знаходження суми перших 5 членів геометричної прогресії потрібно використовувати формулу:

S5 = b1 * (1 - r^5) / (1 - r),

де b1 - перший член прогресії, r - знаменник прогресії.

За умовою завдання, b1 = -0,7 і r = 4, тому можемо підставити значення в формулу:

S5 = -0,7 * (1 - 4^5) / (1 - 4) = -0,7 * (1 - 1024) / (-3) = -0,7 * (-1023) / 3 = 239,4.

Отже, сума перших 5 членів геометричної прогресії дорівнює 239,4.

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a) Rock'n'roll music
b) Cash
c) Spending time with family
d) Having car keys
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a) Spending time with family
b) Spending time with friends
c) Earning money
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b) Half
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