Ответ: b₁=5.
Объяснение:
q=3 S₅=605 b₁=?
Sn=b₁*(qⁿ-1|)/(q-1)
S₅=b₁*(3⁵-1)/(3-1)=605
b₁*(243-1)/2=605
b₁*242/2=605
121*b₁=605 |÷121
b₁=5.
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Ответ: b₁=5.
Объяснение:
q=3 S₅=605 b₁=?
Sn=b₁*(qⁿ-1|)/(q-1)
S₅=b₁*(3⁵-1)/(3-1)=605
b₁*(243-1)/2=605
b₁*242/2=605
121*b₁=605 |÷121
b₁=5.