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nastyonapoigra
@nastyonapoigra
July 2022
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найдите сумму первых 15 членов арифметической прогрессии а1=-10.5, а63=51.5
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ewgenijbark
Verified answer
D = (a63-a1) / 62 = (51.5 + 10.5)/62=62/62=1
S15 = (a1+a15) / 2 * n
a15 = a1 + 14d = -10.5 + 14 = 3.5
S15 = (-10.5 + 3.5) / 2 * 15 = - 7 * 15 = - 105
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Verified answer
D = (a63-a1) / 62 = (51.5 + 10.5)/62=62/62=1S15 = (a1+a15) / 2 * n
a15 = a1 + 14d = -10.5 + 14 = 3.5
S15 = (-10.5 + 3.5) / 2 * 15 = - 7 * 15 = - 105