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Ruzake241
@Ruzake241
March 2022
2
10
Report
Дано:
-1250; - 250; -50; ... - геометрическая прогрессия
Найти:
S5
Ответ: -1562
Как решать?
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лего1фильм2бэтмен3
Сам(а) думай не спрашивай других
0 votes
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Ruzake241
Спасибо за помощь, блин...
Pacanka202
Q=b2:b1=(-250):(-1250)=0,2
b1•(q^5–1) -1250•(-3124/3125)
S5 = --------------- = ---------------------------
q–1 -0,8
(-1250•(-3124)/3125 (2•3124)/5
= -------------------------- = ---------------- =
-0,8 -0,8
6248•5
= ------------ = - 1562
-5•4
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Answers & Comments
b1•(q^5–1) -1250•(-3124/3125)
S5 = --------------- = ---------------------------
q–1 -0,8
(-1250•(-3124)/3125 (2•3124)/5
= -------------------------- = ---------------- =
-0,8 -0,8
6248•5
= ------------ = - 1562
-5•4