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alexgorodov1
@alexgorodov1
August 2022
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5 задание.
Вычислите сумму 23 членов архитектурной прогрессии,если ее 12-й член равняется 2
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m11m
Verified answer
!!!!!!!!!!!!!!!!!!!!!!!!!!!
1 votes
Thanks 2
Pacanka202
S23–?; A12=2
An=A1+d(n–1)
A1+11d=2
A1=2–11d
A23=A1+22d=2–11d+22d=2+11d
(A1+А23)•23 (2–11d+2+11d)23
S23=——————- = ———————— =
2 2
4•23
= ——— = 46
2
0 votes
Thanks 0
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Answers & Comments
Verified answer
!!!!!!!!!!!!!!!!!!!!!!!!!!!
An=A1+d(n–1)
A1+11d=2
A1=2–11d
A23=A1+22d=2–11d+22d=2+11d
(A1+А23)•23 (2–11d+2+11d)23
S23=——————- = ———————— =
2 2
4•23
= ——— = 46
2