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ReleUv
@ReleUv
November 2021
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Выписаны первые несколько членов геометрической прогрессии : 1; -5; 25;... Найдите сумму первых 5 ее членов.
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lubovlubvasil
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1; -5; 25;...
найдем знаменатель прогрессии q=-25/5=-5
S₅=(b₁(1-q⁵)/(1-q)
S₅=1(1-(-5)⁵)/6=3126/6=521
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Verified answer
1; -5; 25;...найдем знаменатель прогрессии q=-25/5=-5
S₅=(b₁(1-q⁵)/(1-q)
S₅=1(1-(-5)⁵)/6=3126/6=521