|1/2-1|+|1/3-1/2|+|1/4-1/3|+……+|1/2009-1/2008|
1-1/1*2-1/2*3-1/3*4-1/4*5……-1/2008*2009的值
初中计算题,难(1-1/2-1/3-……-1/2008)*(1/2+1/3+1/4+……+1/2009)-(1-1/2-
(-1×1/2)+(-1/2×1/3)+(-1/3×1/4)+…+(-1/2008×1/2009)
计算:(2009/1-1)×(2008/1-1)×…×(3/1-1)×(2/1-1)等于多少?
| 1/3 - 1/2 | + | 1/4 - 1/3 | + | 1/5 - 1/4 | …… + | 1/2009
计算乘积(1-1/2^2)(1-1/3^2)(1-1/4^2)……(1-1/2008^2)(1-1/2009^2)
1+(1/2-1)+(1/3-1/2)+(1/4-1/3)+(1/5-1/4)+…+(1/2009-1/2008)+(1
1+2+3+4……+2008+2009+2010=?
求 1/2+1/(2*3)+1/(3*4)+1/(4*5)+……+1/(2008*2009)的值
计算1×1!+2×2!+3×3!+4×4!+…2008×2008!+2009×2009!
1+1/2+1/3+1/4+……+1/2004+1/2005+1/2006+1/2007+1/2008+1/2009+1
计算|1/2011-1/2010|+|1/2010-1/2009||+|1/2009-1/2008|…+|1/3-1/2