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Beautiful00
@Beautiful00
August 2022
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a1=13 an=67 n=25 Sn-?
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m11m
A₁=13 An=67 n=25 Sn-?
An=A₂₅=67
S₂₅=
(A₁+A₂₅)n
=
(13+67)*25
=
80 * 25
= 1000
2 2 2
Ответ: 1000
3 votes
Thanks 3
Beautiful00
d=?
m11m
а зачем оно?
m11m
A25=A1+24d
67=13+24d
67-13=24d
54=24d
d=54/24
d=27/12
d=2.25
Beautiful00
s25=2a1+24d/2 *n
m11m
Эта вторая формула нахождения суммы членов арифметической прогрессии. Есть две формулы нахождении суммы арифметической прогрессии.
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Answers & Comments
An=A₂₅=67
S₂₅=(A₁+A₂₅)n = (13+67)*25 = 80 * 25 = 1000
2 2 2
Ответ: 1000
67=13+24d
67-13=24d
54=24d
d=54/24
d=27/12
d=2.25