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y=1/x與y=x-1交於(a,b) 1/x = x-1 將x=a代入1/x = x-1: 1/a = a-1 將x=a y=b代入y=1/x: b=1/a 1/b=a 1/a - 1/b =(a-1)- a = a-1-a = -1
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