1/3+1/5+1/7+...+1/2007=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/06 03:09:19
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1/2+1/3+1/4+1/5+1/6+1/7+.1/20=
(1+2/1)*(1+4/1)*(1+6/1)*...*(1+20/1)*(1-3/1)*(1-5/1)*(1-7/1)*...*(1-21/1)等于多少
(1+1/2)*(1+1/4)*(1+1/6)*.*(1+1/20)*(1-1/3)*(1-1/5)+(1-1/7)*.*(1-1/2
(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+5-7+...
1-1/2+1/3-1/4+1/5-1/6+1/7-1/8+1/9……+1/19-1/20=?
2/7*20%+5/7*1/5
1/1*3+1/2*4+1/3*5+1/4*6+1/5*7+1/6*8------1/17*19+1/18*20 怎样做
1/1*3+1/2*4+1/3*5+1/4*6+1/5*7+1/6*8------1/17*19+1/18*20
20-(5又7/20+0.15)+6又1/3
输出以下杨辉三角形.1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1 1 7 21 35 35 21 7
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+3+1/6+5+1/12+7+1/20+9+1/30+11+1/42+13+1/56+15+1/72+17+1/90+19+1/110
1 1 1 1 1 3 5 7 1 5 13 25 1 7 25 why
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9=1-1/9=8/9为什么呢?写出解析.
1/3+1/3*5+1/5*7+.+1/19*21=1-1/3+1/3-1/5+1/5+.-1/21=1-1/21=20/211是怎么来的?
1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945