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告訴你一個萬能公式: 二次函數的 頂點為(b/-2a,4ac-b^2) 對稱軸為直線x=b/-2a 與y軸交點為(0,c) 與x軸交點為(x1,x2) 判別式>=0時方程ax^2+bx+c=0的2根為x1,x2
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