F Xy F X F Y

• F X + Y ≤ F X + F Y
• ∆ F X F Y ≤ ∆ X Y
• F X +f Y F X+y/1+xy
• F X+y +f X-y 2f X F Y
• F X +f Y F X+y +xy 求f X
• F Xy F X +f Y 证明减函数
• F Xy F X +f Y 证明减函数
• F Xy 的求导

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F Xy F X F Y

F Xy F X F Y

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F Xy F X F Y