1/1x4+1/4x7+1/7x10+……+1/97x100
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1/1x4+1/4x7+1/7x10+……+1/97x100
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SOS!
![1/1x4+1/4x7+1/7x10+……+1/97x100](/uploads/image/z/1940820-60-0.jpg?t=1%2F1x4%2B1%2F4x7%2B1%2F7x10%2B%E2%80%A6%E2%80%A6%2B1%2F97x100)
1/1x4+1/4x7+1/7x10+……+1/97x100
=(1-1/4)/3+(1/4-1/7)/3+(1/7-1/10)/3+.+(1/97-1/100)/3
=(1/3)(1-1/4+1/4-1/7+1/7-1/10+.+1/97-1/100)
=(1/3)(1-1/100)
=(1/3)(99/100)
=33/100.
=(1-1/4)/3+(1/4-1/7)/3+(1/7-1/10)/3+.+(1/97-1/100)/3
=(1/3)(1-1/4+1/4-1/7+1/7-1/10+.+1/97-1/100)
=(1/3)(1-1/100)
=(1/3)(99/100)
=33/100.
1/1x4+1/4x7+1/7x10+……+1/97x100
小学分数题:1/1x4+1/4x7+1/7x10+.+1/97x100
100x( 3/1x4 + 3/4x7 +3/7x10 +.3/97x100)=?注:1x4、4x7、7x10等均为分母
数学趣味知识园开幕H1.1X4/1+4X7/1+7X10/1+10X13/1+.+97X100/1 2.1X2X3/1+
1/1x4+1/4x7+1/7x10+……+1/2005x2008
1X4/1+4X7/1+7X10/1+…+2005X2008/1=?
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+...+1/100X103=
1/(1x4)+1/(4x7)+1/(7x10)+...+1/(91x94)
1/1X4+1/4X7+1/7X10+.+1/2002X2005=?