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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/X-3/-/X-1/
(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
求一个数独答案X X X 9 X X X 8 2 X 6 3 X X 1 4 X 99 X 8 X X X X X XX X X 6 7 X 3 X XX 4 6 X 5 X 2 9 XX X 7 X 2 3 X X XX X X X X X 7 X 17 X 4 3 X X 6 2 X6 3 X X X 7 X X X
x^5-x^4+x^3-x^2+x-1
|x+1|-|x|+|x-2|-|-x+3|已知x+2