﹙1/2012－1﹚×﹙1/2011－1﹚×﹙1/2010－1﹚×…×﹙1/2000－1﹚
=﹙- 2011/2012﹚×﹙- 2010/2011﹚×﹙-2009/2010﹚×…×﹙- 1999/2000﹚
=(-1)^13×1999/2012
=-1999/20126.898×﹙﹣40﹚＋68.98×﹙﹣3.5﹚＋689.8×﹙﹣0.25﹚