20+19-18-17+16+15-14+13+12+11-10-9简便计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 17:26:15
![20+19-18-17+16+15-14+13+12+11-10-9简便计算](/uploads/image/z/27191-47-1.jpg?t=20%2B19-18-17%2B16%2B15-14%2B13%2B12%2B11-10-9%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
20+19-18-17+16+15-14+13+12+11-10-9简便计算
20+19-18-17+16+15-14+13+12+11-10-9简便计算
20+19-18-17+16+15-14+13+12+11-10-9简便计算
20+19-18-17+16+15-14+13+12+11-10-9
=(20+19-18-17)+(16+15-14+13)+(12+11-10-9)
=(20-18+19-17)+(16-14+15+13)+(12-10+11-9)
=(2+2)+(2+2)+(2+2)
=4+4+4
=12
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