∵2(x-3)/﹙x²+3﹚=0,
∴x=3
∴2x/﹙x²-1﹚÷2x/﹙1-x﹚
=﹛2x/﹙x²-1﹚﹜×﹛﹙1-x﹚/2x﹜
=﹙1-x﹚／﹛﹙x-1﹚﹙x+1﹚﹜
=﹣1/﹙x+1﹚
=﹣1/4