2 5 10 13 26 29 ( 1 4 9 ( ) 25?
8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 24 25 26 27 28 29 30 3
4/1*5+4/5*9+4/9*13+4/13*17+...+4/25*29
1+2+3-4+5+6+7-8+9+10+11-12+13+14+15-16.+25+26+27-28
1,5,11,23,27,32,16,4,9,13,17,29,31,8,2,3,17,19,25,26,7为互质数的有
1+2+4+5+7+8+10+11+13+14+16+17+19+20+22#23+25+26+28+29(求简便算式)
找规律: 2,6,10,14,(),22,26 1,6,5,10,9,14,13(),() 1,4,9,16,25()
1 2 5 10 13 26 29 58 【】 2 3 5 8 13 21【】 55 2 1 4 4 6 7 8 10【
1 2 3 4 5 6 7 8 9 10 11 13 15 17 19 25 28 29 51 57 62 75 91
1 3 6 10 15 21 28 2 5 9 14 20 27 4 8 13 19 26 7 12 18 25 11
0,1,3,2,6,7,5,4,12,13,15,14,10,11,9,8,24,25,27,26,30,31的规律
1+2+3-4+5+6+7-8+9+10+11-12+.+25+26+27-28
奥数题,找规律,2,5,10,13,26,29,(),()