1/(1*3)+1/(5*7)+1/(9*11).1/(2007*2009)要看的明白的

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1/(1*3)+1/(5*7)+1/(9*11).1/(2007*2009)要看的明白的
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1/(1*3)+1/(5*7)+1/(9*11).1/(2007*2009)要看的明白的
1/(1*3)+1/(5*7)+1/(9*11).1/(2007*2009)
要看的明白的

1/(1*3)+1/(5*7)+1/(9*11).1/(2007*2009)要看的明白的
换成模型不就是1/(n+(n+2)),告诉你一个方法是裂项,原式可化为二分之一乘以括号内为1/n-1/(n+2)括号,其它的你自己化吧!

(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 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 (1/3+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+5+7+9 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 1/1*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+...+1/2007*2009=? 1/1*3+1/3*5+1/5*7+1/7*9+.+1/2003*2005 -1/1*3-1/3*5-1/5*7-1/7*9-^-1/19*21