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一般式 y=ax²;+bx+c(a≠0,a、b、c為常數),頂點座標為(-b/2a,4ac-b²;/4a) 頂點式 y=a(x-h)^2+k(a≠0,a、h、k為常數),頂點座標為(h,k)對稱軸為x=h, 代數. x軸上兩點是一般式帶入後方程的根. 對稱軸是x= b/—2a也是要代數
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