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y=2x^2-4x-2 =2(x-1)^2-4 對稱軸x=1,二次項係數2>0,函數影像開口向上,x=1時,有 ymin=-4 f(-1/2)=1/2 f(2)=-2 x=-1/2時,有ymax=1/2 函數的值域為[-4,1/2]
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