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找最值吧.做函數題必須熟練掌握函數圖像,y=x²;-2x+3的影像開口向上,頂點縱坐標在[4×3-(-2^2)]/4這個點,也就是2,所以這個函數y≥2(注:^代表乘方)同理找y=2x²;-3x+1的最值,開口向上,頂點縱坐標-1/8(座標…
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