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答え: 下取り式アプリなど log5(35)-2log5(7/3)+log5(7)-log5(1.8) =log5(5)+log5(7)-2log5(7)+2log5(3)+log5(7)-log5(9/5) =1+log5(9)-log5(9)+log5(5) =1+1 =2
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