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一個數的倒數與這個數的積為1 7分之15-1=8/7
七分之五與他的倒數的積是1
(5分之1+3分之1)乘15(因為15分之1的倒數是15) =5分之1乘15+3分之1乘15 =3+5 =8 第一步可約分
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