(2x-6)/(4-4x+x^2)/(x+3)*x^2-4/3-x如题.

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(2x-6)/(4-4x+x^2)/(x+3)*x^2-4/3-x如题.(2x-6)/(4-4x+x^2)/(x+3)*x^2-4/3-x如题.(2x-6)/(4-4x+x^2)/(x+3)*x^2-

(2x-6)/(4-4x+x^2)/(x+3)*x^2-4/3-x如题.
(2x-6)/(4-4x+x^2)/(x+3)*x^2-4/3-x
如题.

(2x-6)/(4-4x+x^2)/(x+3)*x^2-4/3-x如题.
a,b互为相反数,m,n互为倒数,
所以a+b=0
mn=1
（a+b)n/m-mn
=0×n/m-1
=0-1
=-1

原式=[2(x-3)/(x-2)²(x+3)][-(x+2)(x-2)/(x-3)]
=-2(x-3)(x+2)(x-2)/[(x-2)²(x+3)(x-3)]
=-2(x+2)/[(x-2)(x+3)]
=(-2x-4)/(x²+x-6)

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