作业帮1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)
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1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)
1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)
1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)
1/1X4 = （1/1 - 1/4）/3
1/4X7 = (1/4 - 1/7)/3
...
1/91x94 = (1/91 - 1/94)/3
1/1X4+1/4X7+1/7X10+.+1/91x94
=(1/1-1/4 + 1/4 - 1/7 + ...+ 1/91 - 1/94)x1/3
=(1-1/94)/3
=31/94
1/1x4+1/4x7+…+1/97x100
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注：1x4、4x7、7x10等均为分母的大小
1/1x4+1/4x7+1/7x10+1/10x13+1/13X16 简便
计算：1/（1x4）+1/（4x7）+1/(7x10)…+1/(298x301)
计算1/1x4+1/4x7+1/7x10+***+1/2007x2010
1/1x4+1/4x7+1/7x10+……+1/2005x2008佼佼我
1/1X4+1/4X7+1/7X10+...+1/100X103=
1/1x4+1/4x7+1/7x10+……+1/97x100SOS!SOS!
1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)
1/1X4+1/4X7+1/7X10+.+1/2002X2005=?有规律的
1/1x4+1/4x7+1/7x10+……+1/2005x2008
1X4/1+4X7/1+7X10/1+…+2005X2008/1=?
1/1x4 +1/4x7+1/7x10+.+1/100x103 急用啊
小学分数题：1/1x4+1/4x7+1/7x10+.+1/97x100
1/1x4 + 1/4x7 + 1/7x10 +…+ 1/91x94=?
1X4/1+4X7/1+7X10/1+…+2005X2008/1=?
1/1x4+1/4x7+1/7x11+*******1/97x100=?*是省略号
计算 1X4分之一+4x7分之一+7x10分之一+...+2008x2011分之一的值