((3-x)分之x+3)+(x方+6x+9)分之(x方-9)

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((3-x)分之x+3)+(x方+6x+9)分之(x方-9)((3-x)分之x+3)+(x方+6x+9)分之(x方-9)((3-x)分之x+3)+(x方+6x+9)分之(x方-9)((3-x)分之x+

((3-x)分之x+3)+(x方+6x+9)分之(x方-9)
((3-x)分之x+3)+(x方+6x+9)分之(x方-9)

((3-x)分之x+3)+(x方+6x+9)分之(x方-9)
((3-x)分之x+3)+(x方+6x+9)分之(x方-9)
=(3-x)/(x+3)+(x+3)^2/(x-3)(x+3)
=(3-x+x+3)/(x+3)
=6/(x+3)