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f(x)=(1/2)(x-1)^2+1 對稱軸x=1,x屬於[1,m]時影像在對稱軸右側.函數在[1,m]上單調遞增.當x=m時,函數取得最大值,則 (1/2)(m-1)^2+1=m (1/2)(m-1)^2=m-1 (1/2)(m-1)=1 m-1=2 m=3 m=3
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