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1/3 *(27/100)=1*9/100 1*(3/100)=1/3 * 9/100 9/100 *(100/27)=1* 1/3 所以能與1/3,1,9/100組成比例的數有3個,它們是:27/100,3/100100/27 選項D正確!
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