化简(m*m-2m)/(4-m*m)

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化简(m*m-2m)/(4-m*m)化简(m*m-2m)/(4-m*m)化简(m*m-2m)/(4-m*m)=m(m-2)/(2-m)(2+m)=-m/(m+2)

化简(m*m-2m)/(4-m*m)
化简(m*m-2m)/(4-m*m)

化简(m*m-2m)/(4-m*m)
=m(m-2)/(2-m)(2+m)=-m/(m+2)