42/15+102/35+186/63+294/99+426/143用简算
42/15+102/35+186/63+294/99+426/143用简算
( ) 35 63 80 99 143
1/15+1/35+1/63+1/99+1/143
2/15+2/35+2/63+2/99+2/143
3,15,35,63,99,143下个数是什么
15,35,63,99,143,195,255,323的最小公倍数
巧算:8/3/3+16/15/15+24/35/35+32/63/63+40/99/99+48/143/143
2/3 2/15 2/35 2/63 2/99用简算怎么算
( ),35,63,80,99,143数列问题
有理数题,8/3*3+16/15*15+24/35*35+32/63*63+40/99*99+48/143*143=?
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)=