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1/1x4+1/4x7+1/7x10+...+1/73x76=? 急啊······

来源：学生作业帮 编辑：神马作文网作业帮 分类：数学作业 时间：2024/11/19 22:07:44
1/1x4+1/4x7+1/7x10+...+1/73x76=? 急啊······
1/1x4+1/4x7+1/7x10+...+1/73x76=? 急啊······
1/1x4+1/4x7+1/7x10+...+1/73x76
=1/3(1-1/4+1/4-1/7+...+1/73-1/76)
=1/3*75/76
=25/76
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注：1x4、4x7、7x10等均为分母 1/1x4 +1/4x7+1/7x10+.+1/100x103 急用啊 1/1X4+1/4X7+1/7X10+...+1/100X103= 1/1X4+1/4X7+1/7X10+.+1/2002X2005=? 1X4/1+4X7/1+7X10/1+…+2005X2008/1=? 1/(1x4)+1/(4x7)+1/(7x10)+1/(10x13)简便运算 找规律 急 计算1/1x4+1/4x7+1/7x10+.+1/2002x2005+1/2005x2008 1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便 计算1/1x4+1/4x7+1/7x10+***+1/2007x2010 1/1x4+1/4x7+1/7x10+……+1/2005x2008 1/1x4+1/4x7+1/7x10+……+1/97x100 1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)