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a²;-2ab-3b²;=0; (a-3b)(a+b)=0; a=3b或a=-b; a/b+b/a=(a²;+b²;)/(ab) a=3b時;原式=(10b²;)/(3b²;)=10/3; a=-b時;原式=(2b²;)/(-b²;)=-2;
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