求解初二下册题:求1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)……1/(x+2008)(x+2009)的值.

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求解初二下册题:求1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)……1/(x+2008)(x+2009)的值.

求解初二下册题:求1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)……1/(x+2008)(x+2009)的值.
求解初二下册题:求1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)……1/(x+2008)(x+2009)的值.

求解初二下册题:求1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)……1/(x+2008)(x+2009)的值.
1/(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)……1/(x+2008)(x+2009)
=1/(x+1)+1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3).+1/(x+2008)-1/(x+2009)
=2/(x+1)-1/(x+2009)