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number7seven
@number7seven
July 2022
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в геометрической прогрессии найдите b3, если S5=93 а q=2
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sangers1959
Verified answer
S₅=93 q=2 b₃-?
Sn=(b₁*(1-qⁿ)/(1-q)
S₅=(b₁*(1-2⁵)/(1-2)
(b₁*(-31)/(-1)=93
31*b₁=93 I÷31
b₁=3
b₃=b₁*q²=3*2²=3*4=12
Ответ: b₃=12.
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Answers & Comments
Verified answer
S₅=93 q=2 b₃-?Sn=(b₁*(1-qⁿ)/(1-q)
S₅=(b₁*(1-2⁵)/(1-2)
(b₁*(-31)/(-1)=93
31*b₁=93 I÷31
b₁=3
b₃=b₁*q²=3*2²=3*4=12
Ответ: b₃=12.