1/1*3+1/3*5+1/5*7+1/7*9+.+1/49*51

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1/1*3+1/3*5+1/5*7+1/7*9+.+1/49*51

1/1*3+1/3*5+1/5*7+1/7*9+.+1/49*51
1/1*3+1/3*5+1/5*7+1/7*9+.+1/49*51

1/1*3+1/3*5+1/5*7+1/7*9+.+1/49*51
1/1*3=1/2(1-1/3) 1/3*5=1/2(1/3-1/5)
1/7*9=1/2(1/5-1/7)
1/1*3+1/3*5+1/5*7+1/7*9+.+1/49*51
=1/2(1-1/3+1/3-1/5+.-1/51)
=1/2(1-1/51)
=25/51

1/1*3+1/3*5+1/5*7+1/7*9+......+1/49*51
=1/2*[1/1-1/3]+1/2*[1/3-1/5]+……+1/2*[1/49-1/51]
=1/2*[1-1/51]=25/51

1/1*3 = （1-1/3）*(1/2)
1/3*5 = （1/3-1/5）*(1/2)
....
1/(1*3)+1/(3*5)+1/(5*7)+1/(7*9)+......+1/(49*51)
= (1-1/3)*(1/2)+ (1/3-1/5)*(1/2) + .. + (1/49*-1/51)*(1/2)
= (1-1/3+1/3-1/5 + .. +1/49*-1/51)*(1/2)
= (1-1/51)*(1/2)
= 25/51

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+.+1/2n+1 (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 1 1 1 3 5 7 1 5 13 25 1 7 25 why 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