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令2x+1=t 則x=(t-1)/2 所以f(t)=(t-1)²;/2²;-3×(t-1)/2+2 =t²;/4-2t+15/4 故f(x-2)=(x-2)²;/4-2(x-2)+15/4 =x²;/4-3x+35/4 祝學習快樂
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