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July 2022
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фрифметическая прогрессия -7 -9 -11 найти сумму семи первых членов
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ewgenijbark
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D = -9 - (-7) = - 9 + 7 = - 2
a7 = a1 + 6d = -7 - 12 = -19
S7 = (a1 + a7) / 2 = (-7 - 19)*7/2 = -13*7/2 = -91
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kalbim
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Answers & Comments
Verified answer
D = -9 - (-7) = - 9 + 7 = - 2a7 = a1 + 6d = -7 - 12 = -19
S7 = (a1 + a7) / 2 = (-7 - 19)*7/2 = -13*7/2 = -91
Verified answer