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即(a²;+6a+9)+(y²;-10b+25)=0 (a+3)²;+(b-5)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=0,b-5=0 a=-3,b=5 所以a+b=2
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