1/(57)+1/(79)+1/(911)+……+1/(99101)=

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1/(5*7)+1/(7*9)+1/(9*11)+……+1/(99*101)=1/(5*7)+1/(7*9)+1/(9*11)+……+1/(99*101)=1/(5*7)+1/(7*9)+1/(9*1

1/(5*7)+1/(7*9)+1/(9*11)+……+1/(99*101)=
1/(5*7)+1/(7*9)+1/(9*11)+……+1/(99*101)=

1/(5*7)+1/(7*9)+1/(9*11)+……+1/(99*101)=
1/(5*7)+1/(7*9)+1/(9*11)+……+1/(99*101)
=(1/2)*(1/5-1/7+1/7-1/9+1/9-1/11+.+1/99-1/101)
=(1/2)*(1/5-1/101)
=(1/2)*(96/505)
=48/505

1/(5*7)+1/(7*9)+1/(9*11)+……+1/(99*101)
=(1/2)*(1/5-1/7+1/7-1/9+1/9-1/11+....+1/99-1/101)
=(1/2)*(1/5-1/101)
=(1/2)*(101-5)/505
=(1/2)*(96/505)
=48/505

比较大小:(1/5)^(-1/5),(9/7)^(-7/9) 7,9,-1,5,( 急简算: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 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 1+1+3+5+7+9 |(1/5)-(1/7)|+|(1/9)-(1/7)|+|(1/9)-(1/11)怎么计算计算:1/3*5+1/5*7+1/7*9+1/9*11+1/11*13 (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+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 24点（1）1 1 9 8 （2）9 9 5 7 （3）9 9 9 7 1 9 9 7 1 9 9 7=5 填运算符号 1/5-7/9+4/5=? 12-9-7-1 1、7、9题 1/5*7+1/7*9+1/9*11+1/11*13+...1/53*55 1/5*7+1/7*9+1/9*11+1/11*13+.+1/23*25