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y=t²-2t+3=(t-1)²+2 -1/4≤t≤2 對稱軸為t=1 開口向上 所以函數在[-1/4,1]單調遞減,在[1,2]單調遞增 所以 當t=1時,函數取得最小值2 當t=-1/4時,函數取得最大值(-1/4-1)²+2 =25/16+2=57/16
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