当x=根号3除以3时,代数式x-2分之x²-3x除以[x+3除以(2-x)]的值是

x=√3/3
(x-3)/(x+3)=(√3-9)/(√3+9)
=(√3-9)^2/(-78)
=(18√3-84)/78
=(6√3-28)/27
[(x^2-3x)/(x-2)]/[(x+3)/(2-x)]
=-x(x-3)/(x+3)
=(√3/3)(28-6√3)/27
=(28√3-18)/81