|1/3+(-1/2)|+|1/4+(-1/3)|+|1/5+(-1/4)|+……+|1/2010+(-1/2009)|
|1/3+(-1/2)|+|1/4+(-1/3)|+|1/5+(-1/4)|+……+|1/2010+(-1/2009)|
1/1×2+1/2×3+1/4×5+……+1/2009×2010
| 1/3 - 1/2 | + | 1/4 - 1/3 | + | 1/5 - 1/4 | …… + | 1/2009
1/1*2+1/2*3+1/3*4+1/4*5……+1/2009*2010
1-2+3-4+5……2009-2010
(1+3+5+…+2009)-(2+4+6…+2010)
计算:-1+2-3+4-5……-2009+2010
1+2+3+4+5+6……+2009+2010
计算:1+2+3+4+5+…+2009+2010/(1-1/1006)(1-1/1007)…(1-1/2009)(1-1
(1-1/2)*(1/3-1)*(1-1/4)*(1/5-1)…(1/2009-1)*(1-1/2010)等于多少
1-1/1*2-1/2*3-1/3*4-1/4*5……-1/2008*2009的值
计算:(-1)+(+2)+(-3)+(+4)+(-5)+…+(-2009)+(+2010)