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StoffardKenny
@StoffardKenny
June 2022
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Дана арифметическая прогрессия(аn), в которой а3= -21.4, а13= -40.4.
Найдите разнрсть прогрессии.
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Answers & Comments
ShirokovP
Verified answer
A3 = - 21.4
a13 = - 40.4
a1 + 2d = - 21.4
a1 + 12d = - 40.4
a1 = - 21.4 - 2d
- 21.4 - 2d + 12d = - 40.4
a1 = - 21.4 - 2d
10d = - 19
a1 = - 21.4 - 2d
d = - 1,9
a1 = - 17,6
d = - 1,9
Ответ
d = - 1,9
2 votes
Thanks 3
ОляКрымова
Решение во вложении.
2 votes
Thanks 2
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Answers & Comments
Verified answer
A3 = - 21.4a13 = - 40.4
a1 + 2d = - 21.4
a1 + 12d = - 40.4
a1 = - 21.4 - 2d
- 21.4 - 2d + 12d = - 40.4
a1 = - 21.4 - 2d
10d = - 19
a1 = - 21.4 - 2d
d = - 1,9
a1 = - 17,6
d = - 1,9
Ответ
d = - 1,9