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把點P帶入得出a+b=1/m(1) a^2+b^2=2/m+1/m^2(2) (1)的平方-(2) 得出(a+b)^2-a^2-b^2=1/m^2-2/m-1/m^2 2ab=2/m ab=1/m 所有ab=1/m
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