1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/23 19:00:40
1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45+47+49=?
![1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43](/uploads/image/z/5603802-42-2.jpg?t=1%2B3%2B5%2B7%2B9%2B11%2B13%2B15%2B17%2B19%2B21%2B23%2B25%2B27%2B29%2B31%2B33%2B35%2B37%2B39%2B41%2B43)
典型的等差数列.
等差数列求法:(首项+末项)*项数/2
这道题求法:(1+49)*25/2=625
望楼主采纳!给点分,都赚辛苦钱··
等差数列求法:(首项+末项)*项数/2
这道题求法:(1+49)*25/2=625
望楼主采纳!给点分,都赚辛苦钱··
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+43
那1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 4
1-3+5-7+9-11+13-15+17-19+21-23+25-27+29-31+33-35+37-39+41=?
1+3+5+7+9+11+13+15+17+19+21+25+27+29+31+35+37+39+41+43+47+49
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 37 39 41 …… 其中
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 57 49 41 43
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
A B C D E F G 1 3 5 7 9 11 23 21 19 17 15 13 25 27 29 31 33
罗伯法 一个四阶幻方,1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31