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ab≠0,則a≠0,b≠0 a²;-ab-2b²;=0,(a-2b)(a+b)=0,所以,a=2b或者a=-b 當a=2b時, (3a-b)/(3a+b)=(6b-b)/(6b+b)=5/7 當a=-b時, (3a-b)/(3a+b)=-4b/-2b=2
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