"1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2007)(b+2007)=?"明天就要交的,急……………………………………快啊,我会提高悬赏分的!求你们了,

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"1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2007)(b+2007)=?"明天就要交的,急……………………………………快啊,我会提高悬赏分的!求你们了,"1/ab+1

"1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2007)(b+2007)=?"明天就要交的,急……………………………………快啊,我会提高悬赏分的!求你们了,
"1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2007)(b+2007)=?"
明天就要交的,急……………………………………快啊,我会提高悬赏分的!求你们了,

"1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)……1/(a+2007)(b+2007)=?"明天就要交的,急……………………………………快啊,我会提高悬赏分的!求你们了,
首先不妨设a>b,实际上a,b对称,当a