F Xy F X F Y F X

• ∆ F X F Y ≤ ∆ X Y
• F Xy F X F Y 是什么函数
• F Xy F X F Y 奇偶性
• F X+y F X +f Y / 1+f X F Y
• F X+y +f X-y 2f X F Y
• F Xy+f X Xf Y +2
• F X+y F Xy
• F Xy F X +f Y 的单调性

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F Xy F X F Y F X

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F Xy F X F Y F X