1 1 1 1 1 3 5 7 1 5 13 25 1 7 25 why
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111113571513251725why111113571513251725why111113571513251725why55.1111,1357,151325,172555每组相邻2数差分别为:
1 1 1 1 1 3 5 7 1 5 13 25 1 7 25 why
1 1 1 1 1 3 5 7 1 5 13 25 1 7 25
why
1 1 1 1 1 3 5 7 1 5 13 25 1 7 25 why
55.
1 1 1 1,1 3 5 7 ,1 5 13 25 ,1 7 25 55
每组相邻2数差分别为:
0 0 0,
2 2 2,
4 8 12,
6 18 (30)
上式之间的差分别为:
0=0
0=0
4=4
12=12
(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+.+1/2n+1
1-3+5-7+...
(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+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945
((1/2)-1)*((1/3)-1)*((1/4)-1)*((1/5)-1)*((1/6)-1)*((1/7)-1)*((1/8)-1)*((1/9)-1)*((1/10)-1)
简便运算 (1+1/3+1/5+1/7)*(1/3+1/5+1/7+1/9)-(1+1/3+1/5+1/7+1/7+1/9)*(1/3+1/5+1/7)
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