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x²;-13x+12=-4x²;+18 x²;-13x+12+4x²;-18=0 5x²;-13x-6=0 △=169+4*5*6=17*17 x=(13±17)/10 x=2 x=-2/5
答:x²;-4x+2=0 x²;-4x+4=2 (x-2)²;=2 兩邊開平方得: x-2=±√2 x=2±√2
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