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Нооатак
@Нооатак
July 2022
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Арифметическая прогрессия. В Арифметической прогрессии а5=2,5 и а8=6,5. Найдите а1 и d.
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ShirokovP
Verified answer
A1 + 4d = 2,5
a1 + 7d = 6,5
3d = 4
d = 4/3
a1 = 2,5 - 4d = 5/2 - 16/3 = - 17/6
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Verified answer
A1 + 4d = 2,5a1 + 7d = 6,5
3d = 4
d = 4/3
a1 = 2,5 - 4d = 5/2 - 16/3 = - 17/6