化简(x^2-2x-3)/(x^2+2x+1)÷(x^2-9)/(x^2+x)在线等```速度```不过过程要具体

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化简(x^2-2x-3)/(x^2+2x+1)÷(x^2-9)/(x^2+x)在线等```速度```不过过程要具体
化简(x^2-2x-3)/(x^2+2x+1)÷(x^2-9)/(x^2+x)
在线等```速度```不过过程要具体

化简(x^2-2x-3)/(x^2+2x+1)÷(x^2-9)/(x^2+x)在线等```速度```不过过程要具体
化简(x^2-2x-3)/(x^2+2x+1)÷(x^2-9)/(x^2+x)
=(x-3)(x+1)/(x+1)^2÷(x+3)(x-3)/x(x+1)
=(x-3)/(x+1)*x(x+1)/(x+3)(x-3)
=x/(x+3)

(x-3)(x+1)^2
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x