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max{2^x,2^-x}等價於 {2^-x,2^x2^-x} 然後根據運算子的優先順序求解即可. 值域[1,+∞) 若是填空或選擇之類的題,畫出草圖,就能知道了 y=2^x的大概影像應該能畫吧, y=2^-x與y=2^x的影像關於y軸對稱,y軸兩側的曲線,取位於上方的部分,即構成y=f(x)的影像
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