2/5 5/8 8/11 11/14 1 1/17=?
1/2*5+1/5*8+1/8*11+1/11*14+.+1/17*20=?
2/5 5/8 8/11 11/14 1 1/17=?
(1/2)*5+(1/5)*8+(1/8)*11+(1/11)*14+(1/14)*17+(1/17)*20
5*8/1+8*11/1+11*14/1+14*17/1+17*20/1=?怎样算
1/5*8+1/8*11+1/11*14+1/14*17+1/17*20=?怎样算
①.1/2*5+1/5*8+1/8*11+1/11*14=
(1).11/2*5+11/5*8+11/11*14+11/14*17 (2).1+1/2+3/4+7/8+15/16+
3/5×8+3/8×11+3/11×14+3/14×17+1/17
1/2*5+1/5*8+1/8*11+1/11*14+1/14*17+1/17*20+1/20*23是多少
1/2*1/5+1/5*1/8+1/8*1/1+1/11*1/14+1/14*1/17+1/17*1/20的简便算法
11/2*5+11/5*8+11/11*14+11/14*17
1/5*8 1/8*11 1/11*14 1/14*17 1/17*20 如何简算