13 14 15 16 17 18
13,14,15,16,17,18填空,
12+13+14+15+16+17+18+19=()×()
20-18+17-16+15-14+13-12+11-10
13+14+15+16+17+18+19=?(巧妙算法)
11 12 13 14 15 16 17 18
13,14,15,16,17,18,19题怎么写?
10 14 13 17 19 12 15 18 16
11 12 13 14 15 16 17 18 19 20
13 14 15 16 17
14,15,16,17,18
1/(12*13)+1/(13*14)+1/(14*15)+1/(15*16)+1/(16*17)+1/(17*18)+
10,20,14,13,18,15,16,16,16,19,(),17