(1∕1998-1﹚×﹙1/1997-1﹚×﹙1/1996-1﹚×﹙1/1001-1﹚×﹙1/1000-1﹚=?用递等式做
用递等式做
(1∕1998-1﹚×﹙1/1997-1﹚×﹙1/1996-1﹚×﹙1/1001-1﹚×(......)×﹙1/1000-1﹚共有1+(1998-1000)=999个负数相乘,所以上面的数乘积=-1997/1998*1996/1997*1995/1996*...... *999/1000=-999/1998=-0.5
答:(1/1998-1)×(1/1997-1)×(1/1996-1)×...×(1/1001-1)(1/1000-1) =(-1997/1998)×(-1996/1...详情>>
答:详情>>