1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+1998)(x+1999),
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1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+1998)(x+1999),1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+19
1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+1998)(x+1999),
1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+1998)(x+1999),
1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+1998)(x+1999),
答：
原式
=1/x-1/(x+1)+1/(x+1)-1/(x+2)+...+1/(x+1998)-1/(x+1999)
=1/x-1/(x+1999)
=1999/[x(x+1999)]
1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+......+1/(x+1998)(x+1999),当x=1
2000/1999
1/x-1/(x+1999)
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填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x
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分解因式----（X*X-X)(X*X-X-2)+1
】x(x+1)+x^2(x-1)
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