3x+1+18*3-x>29
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3x+1+18*3-x>293x+1+18*3-x>293x+1+18*3-x>293x+1+54-x>292x>29-552x>-26x>-133x+1+18*3-x=2x+55>292x>-26x
3x+1+18*3-x>29
3x+1+18*3-x>29
3x+1+18*3-x>29
3x+1+54-x>29
2x>29-55
2x>-26
x>-13
3x+1+18*3-x=2x+55>29
2x>-26
x>-13
（2-x）/（x-3）-1/(x-3）=3 (2-x-1)/（x-3）=3 1-x=3x-(15x-12-4x-10) 3（6x-12）=0 11x-22 18x-36=0 29x=58 x=2
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3^(x+1)+18*3^(-X)>29
3x+1+18*3-x>29
计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=?
1/x(x+3)+1/(x+3)(x+6)+...+1/(x+15)(x+18)
x^18+x^15+x^12+x^9+x^6+x^3+1分解因式
/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)
解方程 式子 6-2x+3x=3x-4x+3x+18 6-x+3x=2x-5x+1 2x-1=5x-36-2x+3x=3x-4x+3x+18 6-x+3x=2x-5x+12x-1=5x-3