[(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)]
化简[(x^2-4x-4)/(x+1)-(x^2+8x+13)/(x+2)]/(11x^2+33x+21)
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