1/1X(x+1) + 1/(x+1)(x+2)+1/(x+2)(x+3)……+1/(x+1998)(x+1999) 当x=1时这个代数式的值如何做
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1/1X(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)……+1/(x+1998)(x+1999)当x=1时这个代数式的值如何做1/1X(x+1)+1/(x+1)(x+2)+1/(x+2
1/1X(x+1) + 1/(x+1)(x+2)+1/(x+2)(x+3)……+1/(x+1998)(x+1999) 当x=1时这个代数式的值如何做
1/1X(x+1) + 1/(x+1)(x+2)+1/(x+2)(x+3)……+1/(x+1998)(x+1999) 当x=1时这个代数式的值如何做
1/1X(x+1) + 1/(x+1)(x+2)+1/(x+2)(x+3)……+1/(x+1998)(x+1999) 当x=1时这个代数式的值如何做
裂项.1/x(x+1)=1/x-1/(x+1),1/(x+1)(x+2)=1/(x+1)-1/(x+2),以此类推……
所以最后原式=1/x-1/(x+1999),代入x=1得1999/2000
x/x+(1-x)/x-1/x
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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
七年级下册政治复习提纲(山东人民出版社)第五单元是 青春的脚步 青春的气息别弄错了啊!格式：X X X X X X X X X 1、X X X X X X X X X X.2、X X X X X X X X X.3、X X X X X X X X X X X.
(x+1)(x-1)(x-x+1)(x+x+1)
分解因式----（X*X-X)(X*X-X-2)+1
X(X-1)=X
1.1/x|x/(x+1)|
x/x-1[1+(x-1/x)]
x-1/x÷(x-1/x)
】x(x+1)+x^2(x-1)
1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做
x>1/1-x
x+1/x-1
(X + 1) /(x - 1)
(1+X)/(1-X)
|x+1|+|x-1|
/X-3/-/X-1/