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即(a²;-6a+9)+(b²;-8b+16)=0 (a-3)²;+(b-4)²;=0 平方大於等於0,相加等於0,若有一個大於0,則另一個小於0,不成立. 所以兩個都等於0 所以a=3,b=4 b/a-a/b=4/3-3/4=7/12
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