1/[x(x-1)]+1/[x(x+1)]+…+1/[(x+9)(x+10)]=1/(x+10)
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1/[x(x-1)]+1/[x(x+1)]+…+1/[(x+9)(x+10)]=1/(x+10)1/[x(x-1)]+1/[x(x+1)]+…+1/[(x+9)(x+10)]=1/(x+10)1/[x
1/[x(x-1)]+1/[x(x+1)]+…+1/[(x+9)(x+10)]=1/(x+10)
1/[x(x-1)]+1/[x(x+1)]+…+1/[(x+9)(x+10)]=1/(x+10)
1/[x(x-1)]+1/[x(x+1)]+…+1/[(x+9)(x+10)]=1/(x+10)
1/[x(x-1)]= 1/(X-1) - 1/X
1/[x(x+1)]=1/X -1/(X+1)
1/(X-1)-1/X+1/X-1/(X+1)+...+1/(X+9)-1/(X+10)
=1/(x+10)
1/(X-1)-1/(X+10)=1/(x+10)
1/(X-1)=2/(x+10)
2(x-1)=x+10
2x-2=x+10
x=12
x/x+(1-x)/x-1/x
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(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/