1*1/3+3*1/5+5*1/7+.+97*1/99+99*1/101=

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/17 19:01:29

1*1/3+3*1/5+5*1/7+.+97*1/99+99*1/101=
1*1/3+3*1/5+5*1/7+.+97*1/99+99*1/101=

1*1/3+3*1/5+5*1/7+.+97*1/99+99*1/101=
1*1/3+3*1/5+5*1/7+.+97*1/99+99*1/101
=1/2x【（1-1/3）+（1/3-1/5）+（1/5-1/7）+...+（1/99-1/101）】
=1/2x(1-1/101)
=50/101

原式=1/2+2/3+3/4+……+98/99+99/100
=(1-1/2)+(1-1/3)+(1-1/4)+……+(1-1/99)+(1-1/100)
=100-1/2-1/3-1/4-……-1/99-1/100
……

1-3+5-7+... (1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简算(1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/9)*(1/3+1/5+1/7) 简便计算 1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945 (1/3+1/5+1/7)*(1/5+1/7+1/9)-(1/3+1/5+1/7+1/9)*(1/5+1/7)=? 1/3+1/5+1/7+.+1/2n+1 1/1*3*5+1/3*5*7+1/5*7*9.+1/95*97*99 1/1×3+1/3×5+1/5×7+1/7×9.+1/2011×2013 简算:1/1*3+1/3*5+1/5*7+1/7*9+1/9*11 1/1*3+1/3*5+1/5*7+1/7*9+...1/17*19= 计算1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+.+1/(19×21) 1/1×3+1/3×5+1/5×7+1/7×9+.+1/2013×2015 1/1*3+1/3*5+1/5*7+1/7*9+.+1/101*103 帮帮忙1/1*3+1/3*5+1/5*7+1/7*9+...1/99*101 1/1*3+1/3*5+1/5*7+1/7*9+1/49*51= 计算：1/1×3+1/3×5+1/5×7+1/7×9``````+1/2001×2003 (1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1 1/1*3+1/3*5+1/5*7+1/7*9+1/9*11 (1*3)/1+(3*5)/1+(5*7)/1+(7*9)/1+(9*11)/1