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+1/195用裂项做
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
(1-1/15)+(1-1/35)+(1-1/63)+(1-1/99)+(1-1/143)+(1-1/195)+(1-1
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
计算1/3+1/15+1/35+1/63+1/99+1/143+1/195+255+1/323+1/399
1/15+1/35+1/63+1/99+1/143
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.