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2^m=5^n=10だから だからm=log(2 10)n=log(5 10)(log(2 10)は2を底10の対数、log(5) 10)は底10の5の対数を表します) したがって、m+n=log(2 10)+log(5 10)=1/lg2+1/lg5=1/(lg2*lg5)
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