20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1 用简便方法计算上面一题
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20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1用简便方法计算上面一题20-19-18-17-16-15-14-13-12-11-10-9-8-7-
20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1 用简便方法计算上面一题
20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1 用简便方法计算上面一题
20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1 用简便方法计算上面一题
20-19-18-17-16-15-14-13-12-11-10-9-8-7-6-5-4-3-2-1
=20-[(19+1)*9+10]
=20-190
=-170
14,15,16,17,18,19,20
20-19+18-17+16-15+14-.-2+1=?
11 12 13 14 15 16 17 18 19 20
20×20-19×19+18×18-17×17+16×16-15×15+14×14...+2×2-1×1 怎么算?
14/15/16/17/18/19题,..
14,15,16,17,18,19
14 15 16 17 18 19
物理14-15-16-17-18-19
17,18,15,14,19,20,13,
10,20,14,13,18,15,16,16,16,19,(),17
15 16 17 18 19 20
15 16 17 18 19 20
15 16 17 18 19 20
15,16,17,18,19,20题
12,14,15,16,18,19,20
1/(12*13)+1/(13*14)+1/(14*15)+1/(15*16)+1/(16*17)+1/(17*18)+1/(18*19)+1/(19*20)=?
11,12,13,14,15,16,17,18,19,20的英文怎么写?
11 12 13 14 15 16 17 18 19 20 的英语怎么说