[17/25-(2/5+3/20]×2/13
1,3,5,7,9,11,13,15...2,5,8,11,14,17,20,23...7,13,19,25,31,37
观察下面几组数:1,3,5,7,9,11,13,15,…2,5,8,11,14,17,20,23,…7,13,19,25
3/5,3/5,2/3,3/4,()A:17/20,B:19/20,C:21/25,D:23/25
数列规律寻找1 2 5 10 17 4 3 6 11 18 9 8 7 12 1916 15 14 13 20 25 2
2+3+4+5+7+8+9+10+12+13+14+15+17+18+19+20+22+23+24+25+27+.+10
2+3+4+5+7+8+9+10+12+13+14+15+17+18+19+20+22+23+24+25+……+1000
1 2 3 4 5 16 17 18 19 6 15 24 25 20 7 14 23 22 21 8 13 12 11
数字规律问题 1 2 5 10 17 4 3 6 11 18 9 8 7 12 19 16 15 14 13 20 25
什么时候17+25=13 2-3=6?
1/3+2/5+3/7+7/12+9/20+11/28+17/30+25/42
13/16×(9/13×17-9/13)-(12*4/5-3*5/13-2*8/13)
20以内的素数为什么是2,3,5,7,9,11,13,17,19