【x-(1/3x+15)]-(1/3x+15)=15的过程
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[(x+2)/(x+3)-(x+1)/(x+2)+(x+4)/(x+5)-(x+3)/(x+4)]/[(x的平方+7x+13)/(x的平方+8x+15)]
计算:[(x+2)/(x+3) - (x+1)/(x+2) + (x+4)/(x+5) - (x+3)/(x+4) / (x^2 + 7x + 13)/(x^2 + 8x + 15)
(x-1)(x+1)(x+3)(x+5)+15
(x-1)(x+1)(x+3)(x+5)+15
因式分解 (x+1)(x+3)(x+5)(x+7)+15
(x+1)(x+3)(x+5)(x+7)+15因式分解
因式分解1+x+x^2+x^3+```+x^15
(x+1)(x+2)(x+3)(x+4)-15
/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)