(1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009)
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/29 05:14:27
(1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009)
1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009) 这是题
1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009) 这是题
(1/2+1/3+1/4+...+1/2010)(1+1/2+1/3+...+1/2009)-(1+1/2+1/3+...+1/2010)(1/2+1/3+1/4+...+1/2009)
令1/2+1/3+1/4+...+1/2009=k
则原式=(k+1/2010)(1+k)-(1+k+1/2012)k
=k+k²+1/2010+1/2010k-k-k²-1/2010k
=1/2010
令1/2+1/3+1/4+...+1/2009=k
则原式=(k+1/2010)(1+k)-(1+k+1/2012)k
=k+k²+1/2010+1/2010k-k-k²-1/2010k
=1/2010
(1/2+1/3+……+1/2010)(1+1/2+1/3+……+1/2009)
(2011/1-1)(2010/1-1)(2009/1-1)…(3/1-1)(2/1-1)
1/1×2+1/2×3+1/4×5+……+1/2009×2010
(-1)+(+2)+(-3)+(+4)+……+(-2009)+(+2010)等于多少
2012+2011+2010+2009+……+3+2+1=?
1-2+3-4+5……2009-2010
1+2+3+4……+2008+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
|1/3+(-1/2)|+|1/4+(-1/3)|+|1/5+(-1/4)|+……+|1/2010+(-1/2009)|
六年级数学简算题(1/2+1/3+…+1/2010)*(1+1/2+1/3+…+1/2009)-(1+1/2+1/3+…