[(-5)-(-1/3)+1/7]+(-105)=
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[(-5)-(-1/3)+1/7]+(-105)=[(-5)-(-1/3)+1/7]+(-105)=[(-5)-(-1/3)+1/7]+(-105)=(-105)/[(-1/3)+(+1/5)-(-1
[(-5)-(-1/3)+1/7]+(-105)=
[(-5)-(-1/3)+1/7]+(-105)=
[(-5)-(-1/3)+1/7]+(-105)=
(-105)/[(-1/3)+(+1/5)-(-1/7)]
= (-105)/[(-35/105)+(+21/105)-(-15/105)]
=(-105)/[1/105]
=-1
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
(1/3+1/5+1/7)*(1/5+1/7+1/9)-(1/3+1/5+1/7+1/9)*(1/5+1/7)=?
1,3,5,7,9.
化简5／7：1／3
7/3*[7/5-(7/3+5/1)]简便算法
1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945
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