作业帮1/x(x+3) + 1/(x+3)(x+6)+...+1/(x+33)(x+36)=3/40
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1/x(x+3) + 1/(x+3)(x+6)+...+1/(x+33)(x+36)=3/40
1/x(x+3) + 1/(x+3)(x+6)+...+1/(x+33)(x+36)=3/40
1/x(x+3) + 1/(x+3)(x+6)+...+1/(x+33)(x+36)=3/40
1/3*[1/x-1/(x+3)+1/(x+3)-1/(x+6)+……+1/(x+33)-1/(x+36)]=3/40
1/x-1/(x+36)=9/40
36/x(x+36)=9/40
x^2+36x=160
(x-4)(x+40)=0
x=4,x=-40
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(3x/x-1)
x-3(x-1)
| X+1 |>| X-3 |
x+3/x-1
(x +1)(x-3)
(x+3)(x-1)
|x+1|-|x-3|
(x+1)(x-3)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
[x（x+1）+x平方（x-1)]+（-3x)
x{x+1}{x-1}}x-2}{x-3}-40
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x^5-x^4+x^3-x^2+x-1
|x+1|-|x|+|x-2|-|-x+3|已知x+2