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buryanmarina
@buryanmarina
June 2023
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знайдіть сьомий член і суму перших дванадцяти членів геометричної прогресії, якщо a1=1; a2=4
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nubasik00
Ответ:
d = 4-1 =3
S12 = 2*1+2*11/2 * 12 = 210
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Answers & Comments
Ответ:
d = 4-1 =3
S12 = 2*1+2*11/2 * 12 = 210