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両辺の対数をとって
log(C_r) = log(C_0*e^(-kt))
= log(C_0) + log(e^(-kt))
= log(C_0) - kt
kt = log(C_0) - log(C_r)
= log(C_0/C_r)
t = log(C_0/C_r)/k
です。

y

ありがとうございました!

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