1,1,1,3,5,9,( ),( )
1,1,1,3,5,9,( ),( )
1/(1*3*5)+1/(3*5*7)+1/(5*7*9)+1/(7*9*11)+1/(9*11*13+)1/(11*1
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
5/9+(3/4-1/2)
(1+1/2)*(1+1/3)*(1+1/4)*(1+1/5)* …… *(1+1/9) * (1+1/10)
(1+1/2)*(1+1/4)*.(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)=?请写出过程和道理
(1) 1,1/3,1/5,1/7,1/9 (2)- 1/2*1,1/2*2,- 1/2*3,1/2*4,-1/2*5
(1)1-3+5-7+9-11+...-2011
[5/6-(1/2-1/3)]×9/10
1+3+5+7+9+.+(2n-1)=
-1,-1/3,1/5,1/7,-1/9,-1/11,1/13,1/15.第2001个数是().
1/(3*5)+1/(5*7)+1/(7*9)+…1/(103*105)