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✨ Best Answer ✨

[a]で底を表すものとすると
log[b]8
  底をaに変換して
= (log[a]8)÷(log[a]b)
  log[a]bを底bに変換して
= (log[a]8)÷(1/log[b]a)
= (log[a]8)×(log[b]a)
です

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