1/1x4+1/4x7+…+1/97x100
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+
1X2+2X4+3X6+.50X100
1/1x4+1/4x7+1/7x10+……+1/2005x2008
1X4/1+4X7/1+7X10/1+…+2005X2008/1=?
简便计算1/2+1/2x3+1/3x4+1/4x5+...+1/99x100
求1x2,2x3,3x4,4x5,……98x99,99x100的倒数和
计算1x2+2x3+3x4+4x5+...+99x100
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
x8+x7+x6+x5+x4+x3+x2+x+1因式分解