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Originally posted by liweizk at 2010-05-10 06:59:58:
ÒòΪf(x)=f(x)+f(1),¹Êf(1)=0.
ÀûÓõ¼Êý¶¨Òå,¿ÉµÃf(x)µÄµ¼ÊýµÈÓÚ1/x,»ý·Öºó¼´¿ÉÇó½â.

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