设1994=x,则原式变形为:
[x+﹙x-1﹚×﹙x+1﹚]/[x﹙x+1﹚-1]+[﹙x+1﹚+x﹙x+2﹚]/[﹙x+1﹚﹙x+2﹚-1]
=﹙x+x²-1﹚/﹙x²+x-1﹚+﹙3x+x²+1﹚/﹙x²+3x+1﹚
=1+1
=2.