11,13,15,17,19,31,33,35,37,39,51,53,55,57,59,71,77,79,91,93,
11,13,15,17,19,31,33,35,37,39,51,53,55,57,59,71,77,79,91,93,
(1+11+21+31+41+51+1+71+81+91)+(9+19+29+39+49+59+69+79+89+99)
11*19+21*29+31*39+41*49+51*59+61*69+71*79+81*89+91*99 = 3308
22 13 47 39 56 19 21 73 69 78 53 63 77 97 43 71 17 59 91 83
2 3 5 7 11 13 17 19 23 29 31 37 41 13 47 51 53 59 61 67 71 7
27+29+31+33+35+37+39+41+43+45+47+49+51+53+55+57=()*()=672
(17/31+37/53+39/91)×(37/53+39/91+31/51)—(17/31+37/53+39/91+3
那1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 4
11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45,计算时有什么
11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45,计算时规律?
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43
1-3+5-7+9-11+13-15+17-19+21-23+25-27+29-31+33-35+37-39+41=?