先化简,再求值；x-3分之x-x的平方-3x分之3x-x分之3,其中x=2分之3

x/(x-3) - 3x/(x^2-3x) -3/x 通分得
=x^2/(x^2-3x) - 3x/(x^2-3x) - 3*(x-3)/(x^2-3x)
=(x^2-3x -3x +9 ) /(x^2-3x)
=(x-3)(x-3) /(x*(x-3))
=(x-3)/x
当x=3/2时
原式= (3/2 -3)/(3/2)
= -1