1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+...+1/[(x+99)(x+100)]+1/(x+100)=1999/2000
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1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+...+1/[(x+99)(x+100)]+1/(x+100)=1999/20001/[(x+1)(x+2)]+1/[(x+2)(x+3)]
1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+...+1/[(x+99)(x+100)]+1/(x+100)=1999/2000
1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+...+1/[(x+99)(x+100)]+1/(x+100)=1999/2000
1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+...+1/[(x+99)(x+100)]+1/(x+100)=1999/2000
1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+...+1/[(x+99)(x+100)]+1/(x+100)
=1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+...+1/(x+99)-1/(x+100)+1/(x+100)
=1/(x+1)
=1999/2000
x=1/1999
...
原式可化为
[1/(x+1)-1/(x+2)]+[1/(x+2)-1/(x+3)]+...+1/（x+100）=1999/2000；1/（x+1）=1999/2000，X=1/1999
原式=1/[(x+1)(x+2)]+1/[(x+2)(x+3)]+...+1/[(x+99)(x+100)]+1/(x+100)
=1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+...+1/(x+99)-1/(x+100)+1/(x+100)
=1/(x+1)
=1999/2000
x=1/1999
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