3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/22 14:41:20
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算3/1x5+3/5x9+3/9x13+...+3/1997x2001简算3/1x5+3/5x9+3/9x13+...+3/199
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
3/1x5+3/5x9+3/9x13+...+3/1997x2001
=3/4(4/1x5+4/5x9+4/9x13+...+4/1997x2001)
=3/4(1/1-1/5+1/5-1/9+1/9-1/13+...+1/1997-1/2001)
=3/4(1-1/2001)
=(3/4)(2000/2001)
=500/667
原式=3/4(1-1/5+1/5-1/9+…+1/1997-1/2001)=3/4(1-1/2001)=500/67
3/1x5+3/5x9+3/9x13+...+3/1997x2001简算
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11+1/11x13=
2/3+2/3x5+2/5x7+2/7x9+2/9x11+2/11x13=?
1/3十1/3x5十1/5X7十1/7x9十1/9X11十1/11X13
2/3+2/3x5+2/5x7+2/7x9+2/9x11+2/11x13=多少?
1.1x3.3x5.5x7.7x9.9x11.11x13.13x15.15x17.17x19.19=多少
1/1X5+1/5X9+1/9X13+.+1/2005X2009
1/1x5+1/5x9+1/9x13+……1/33x37
1/1x5+1/5x9+1/9x13+……+1/25x29
计算1x5/ 1+5x9/ 1+9x13/1+…+2009x2013/1求解QuQ..
1/1x5十1/5x9十1/9x13十有什么规律
1x5分之1+5x9分之1+9x13……+397x401分之1?
4/1x5+4/5x9+4/9x13+...+4/25x29
1/2+1/6+1/12+1/20+1/30+1/42+1/56 ; 1/1x3+1/3x5+1/5x7+1/7x9+1/9x11+1/11x13
2x2/1x3+4x4/3x5+6x6/5x7+8x8/7x9+10x10/9x11+12x12/11x13 仔细看看 给50啊
1/1x5+1/5x9+1/9x13+1/13x17+1/17x21=?如何简便运算?
1/(1x5)+1/(5x9)+1/(9x13)+……+1/(401x405) 找规律计算 要过程 急
简便计算:1x5分之4+5x9分之4+9x13分之4+...+37x41分之4