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設三個互不相等的實數為a-d,a,a+d,(d≠0)交換這三個數的位置後:①若a是等比中項,則a2=(a-d)(a+d)解得d=0,不符合;②若a-d是等比中項則(a-d)2=a(a+d)解得d=3a,此時三個數為a,-2a,4a,公比為-2或三…
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