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設一個奇數為x,則另一個奇數為x+2 則有1/x-1/(x+2)=2/143 x(x+2)=143 (x+1)^2=144 x+1=12 =-12 x=11 =-13 倒數為1/11,1/13 或-1/13,-1/11 1樓的真馬虎,最後一步算錯了.
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