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August 2022
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Знайдіть номер члена арифметичної прогресії 3,4; 2,7;2,0;1,3...який дорівнює -5,7
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ShirokovP
Verified answer
A1 = 3,4
a2 = 2,7
d = a2 - a1 = 2,7 - 3,4 = - 0,7
an = a1 + d(n - 1)
3,4 - 0,7 (n - 1) = - 5,7
3,4 - 0,7n + 0,7 = - 5,7
- 0,7n + 4,1 = - 5,7
- 0,7n = - 9,8
n = 14
1 votes
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Answers & Comments
Verified answer
A1 = 3,4a2 = 2,7
d = a2 - a1 = 2,7 - 3,4 = - 0,7
an = a1 + d(n - 1)
3,4 - 0,7 (n - 1) = - 5,7
3,4 - 0,7n + 0,7 = - 5,7
- 0,7n + 4,1 = - 5,7
- 0,7n = - 9,8
n = 14