1/15+1/35+1/63+1/99

1/15+1/35+1/63+1/99+1/143 1/3+1/15+1/35+1/63+1/99 1\3+1\15+1\35+1\63+1\99 简算：1/15+1/35+1/63+1/99 1/15+1/35+1/63+1/99 1/3+1/15+1/35+1/63+1/99+1/145+1/195+1/255 (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)= （1/3+1/15+1/35+1/63+1/99+1/143）*80