1/2*3+1/3*4+1/4*5.+1/2008*2009
1/1*2+1/2*3+1/3*4+1/4*5.+1/2007*2008+1/2008*2009=?
1/2*3+1/3*4+1/4*5.+1/2008*2009
1+2-3-4+5...+2005+2006-2007-2008+2009
1/2*1/3+1/3*1/4+1/4*1/5.+1/2008*1/2009怎么解?
计算:|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2009-1/2008|
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+.+(-1/2008*1/2009)+(-1/2009*1
|1/2-1|+|1/3-1/2|+1/4-1/3|+...|1/2009-1/2008|+|1/2010-1/2009
"1*2/1+2*3/1+3*4/1+.+2007*2008/1+2008*2009/1+2009*2010/1"这道题
计算1×1!+2×2!+3×3!+4×4!+…2008×2008!+2009×2009!
计算:|1/2-1|+|1/3-1/2|+|1/4-1/3|+...+|1/2008-1/2007|+|1/2009-1
1/1*2+1/3*4+1/4*5+.+1/2008*2009
1/(2*3)+1/(3*4)+1/(4*5)+.+1/(2008*2009)如何简算