原式=2(x+3)/(x-2)²×(x-2)/x(x+3)-1/(x-2)
=2/x(x-2)-1/(x-2)
=2/x(x-2)-x/x(x-2)
=(2-x)/x(x-2)
=-1/x
当x=√2时
原式=-1/√2
=-√2/2