化简[(x^2-4x-4)/(x+1)-(x^2+8x+13)/(x+2)]/(11x^2+33x+21)
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化简[(x^2-4x-4)/(x+1)-(x^2+8x+13)/(x+2)]/(11x^2+33x+21)
![化简[(x^2-4x-4)/(x+1)-(x^2+8x+13)/(x+2)]/(11x^2+33x+21)](/uploads/image/z/19684186-34-6.jpg?t=%E5%8C%96%E7%AE%80%5B%EF%BC%88x%5E2-4x-4%EF%BC%89%2F%28x%2B1%29-%28x%5E2%2B8x%2B13%29%2F%28x%2B2%29%5D%2F%2811x%5E2%2B33x%2B21%29)
[(x^2-4x-4)/(x+1)-(x^2+8x+13)/(x+2)]/(11x^2+33x+22)=[(x+1)-(6x+5)/(x+1)-(x+2)-(4x+9)/(x+2)]/(11x^2+33x+22)=[-1-6+1/(x+1)-4-1/(x+2)]/(11x^2+33x+22)={-11+1/[(x+1)(x+2)]}/(11x^2+33x+22)=1/[(x+1)(x+2)]
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