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1,求其二次導數,為負,所以其為上凸函數,所以f((x1+x2)/2)>=f(x1)+f(x2)/2 2,直接算,也很簡單在x1,x2中設一個為變元,然後就是求函數的單調性的問題,方法很多 建議使用第二種
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