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f(x)=x²;-2ax+1f(x)=(x-a)²;+1-a²;此函數為二次函數,開口向上,對稱軸是x=a當a≤1時x∈[1,3] f(x)是增函數,最大值是f(3)=10-6a,最小值是f(1)=2-2a當1≤a≤2時x=3距離對稱軸的距離比x=1的遠所以f(3)>f(1)…
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