(1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1
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(1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1/255)+(1-1/323)+(1-1/399)+(1-1/483)
(1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1/255)+(1-1/323)+(1-1/399)+(1-1/483)
=(1+1+.1)-(1/15-1/35-1/63-.1/399-1/483)
=9-(1/3-1/5+1/5-1/7+1/7-1/9+.1/19-1/21+1/21-1/23)
=9-(1/3-1/23)
=9-20/69
=8又49/69
再问: 错了,应9减1/2*(1/3-1/5……1/21-1/23)
再答: 嗯, =9-1/2(1/3-1/5+1/5-1/7+1/7-1/9+............1/19-1/21+1/21-1/23) =9-1/2(1/3-1/23) =9-10/69 =8又59/69 疏忽了 忘谅解
=(1+1+.1)-(1/15-1/35-1/63-.1/399-1/483)
=9-(1/3-1/5+1/5-1/7+1/7-1/9+.1/19-1/21+1/21-1/23)
=9-(1/3-1/23)
=9-20/69
=8又49/69
再问: 错了,应9减1/2*(1/3-1/5……1/21-1/23)
再答: 嗯, =9-1/2(1/3-1/5+1/5-1/7+1/7-1/9+............1/19-1/21+1/21-1/23) =9-1/2(1/3-1/23) =9-10/69 =8又59/69 疏忽了 忘谅解
(1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1
简算:3/1+15/1+35/1+63/1+99/1+143/1+195/1=?
1/3+1/15+1/35+1/63+1/99+1/143+1/195简便
1/15+1/35+1/63+1/99+1/143+1/195的简便算法
30*(1/15+1/35+1/63+1/99+1/143+1/195)=
30*(1/15+1/35+1/63+1/99+1/143+1/195) 简便方法
1/15+1/35+1/63+1/99+1/143+1/195用裂项做
1/15+1/35+1/63+1/99+1/143
计算1/3+1/15+1/35+1/63+1/99+1/143+1/195+255+1/323+1/399
1+1/15+3+1/35+5+1/63+7+1/99+9+1/143+11+1/195=?
(1+1/15)+(3+1/35)+(5+1/63)+(7+1/99)+(9+1/143)+(11+1/195)
1/3+1/15+1/35+1/63+1/99+1/143+1/195=?请简便计算.