x-6/(4-4x+x^2)除以(x+3)乘以1/3-x

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x-6/(4-4x+x^2)除以(x+3)乘以1/3-x

x-6/(4-4x+x^2)除以(x+3)乘以1/3-x
x-6/(4-4x+x^2)除以(x+3)乘以1/3-x

x-6/(4-4x+x^2)除以(x+3)乘以1/3-x
(x^2-4x-2)(1-3x)/3(2-x)^2(x+3)