1/(1*3)+1/(3*5)+1/(5*7)+.1/(2013*2015)
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1/(1*3)+1/(3*5)+1/(5*7)+.1/(2013*2015)1/(1*3)+1/(3*5)+1/(5*7)+.1/(2013*2015)1/(1*3)+1/(3*5)+1/(5*7)+
1/(1*3)+1/(3*5)+1/(5*7)+.1/(2013*2015)
1/(1*3)+1/(3*5)+1/(5*7)+.1/(2013*2015)
1/(1*3)+1/(3*5)+1/(5*7)+.1/(2013*2015)
1/(1*3)+1/(3*5)+1/(5*7)+……+1/(2013*2015)
=1/2(1-1/3)+1/2(1/3-1/5)+1/2(1/5-1/7)+……+1/2(1/2013-1/2015)
=1/2(1-1/3+1/3-1/5+1/5-1/7+……+1/2013-1/2015)
=1/2(1-1/2015)
=1/2×2014/2015
=1007/2015
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原式=1/2[(1-1/3)+(1/3-1/5)+.....+(1/2013-1/2015)]
=1/2(1-1/2015)
=1007/2015
1007/2015
把1/（1×3）分解为1/2×（1－1/3）即可，以此类推
化简1/3：1/5
1+1+5+25+3
1/3+1/5是什么意思?
1+1+2+3*5
(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+1+1+1-5+5-5+1+1-2+3+3+3+3-6-3-3等于多少?
5(X-3)+1
1+3+5+.+99
1 3 5题,
1、2、3、5,
1,3,5题
1-3+5-7+...
1,3、5题
1+3+5+...+2011
1,3,5题,
3 1 5是什么意思?
1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945
3/1：4/1：5/1化简是?