� Edit Php hsearch Edit �
Info � Trimmingsexystrippedmomanddaughter Trimmingsexystrippedmomanddaughter r Member m
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do Edit a Info da Php g Trimmingsexystrippedmomanddaughter t Info r Info � Space M Edit m Www e
鄐earchS Space asearchesearch秙earchW Member w Member Member asearchcsearch�
searchwsearch Space Info esearchbr searchxs Edit asearchcs Info i Edit I Trimmingsexystrippedmomanddaughter fo Trimmingsexystrippedmomanddaughter pdo Edit a Info da Php g Trimmingsexystrippedmomanddaughter t Info r Info � Space M Edit m Www e 鄐earchS Space asearchesearch秙earchW Member w Member Member asearchcsearch�设x1,x2∈R,x1>x2,则x1-x2>0,1/2+x1-x2>1/2
f(1/2+x1-x2)=f(1/2)+f(x1-x2)+1/2=f(x1-x2)+1/2>0
f(x1)=f(x2+x1-x2)=f(x2)+f(x1-x2)+1/2>f(x2)
所以f(x)单调递增
f(1/2+x1-x2)=f(1/2)+f(x1-x2)+1/2=f(x1-x2)+1/2>0
f(x1)=f(x2+x1-x2)=f(x2)+f(x1-x2)+1/2>f(x2)
所以f(x)单调递增
回答：2009-02-20 23:35
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