若a=1 b=2,求1/ab+1/(a+1)(b+

若a=1 b=2,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+...+1/(a+2003)(b+20

1个回答

提示一下:
1/2002*2003=1/2002-1/2003
1/2003*2004=1/2003-1/2004
1/2004*2005=1/2004-1/2005
自己做最有意思

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