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1/3 = 3⁻¹ を使います。
log 1/3 = log 3⁻¹ = - log 3 になります。

定番の🍔🍟

log 1/3 = log 1 - log 3 = 0 - log 3 = - log 3
でも同じです。
どちらかを使えば、大丈夫です。

ナガマツさん

ありがとうございました!

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