(1/15 1/35 1/63 1/99)*2
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
探索规律 3,15,35,63,99,{ },195.1/2,1/6,1/12,1/20,{ },{ } ,{ },{
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
简便计算:9.99x22.2+33.3x3.34 1/3+1/15+1/35+1/63+1/99+1/143
求1\3+2\15+2/35+1/63+7/99的值