Question

8到28之间包括8和28,那4个数字加起来是69,有多少组都要,谢谢

Answer 1

69=8+61=8+28+9+24=8+28+10+23=8+28+11+22=8+28+12+21=8+28+13+20=8+28+14+19=8+28+15+18=8+28+16+17
69=8+61=8+27+9+25=8+27+10+24=8+27+11+23=8+27+12+22=8+27+13+21=8+27+14+20=8+27+15+19=8+27+16+18
69=8+61=8+26+10+25=8+26+11+24=8+26+12+23=8+26+13+22=8+26+14+21=8+26+15+20=8+26+16+19=8+26+17+18
69=8+61=8+25+12+24=8+25+13+23=8+25+14+22=8+25+15+21=8+25+16+20=8+25+17+19
69=8+61=8+24+14+23=8+24+15+22=8+24+16+21=8+24+17+20=8+24+18+19
69=8+61==8+23+16+22=8+23+17+21=8+23+18+20
69=8+61=8+22+18+21=8+22+19+20
就这么多组，没了。再写下去个个重复了。

Answer 2

4个数和为69，最接近平均数的组合是17，17，17，18.不考虑重复即为15，17，18，19可以在这四个数的基础上采取一部分减，另一部分加的方法穷举出所有组合。

Answer 3

10,20,28,11,10,20,27,12

Answer 4

8,9,24,28
8,9,25,27
8,10,23,28
8,10,24,27
8,10,25,26
8,11,22,28
8,11,23,27
8,11,24,26
8,12,21,28
8,12,22,27
8,12,23,26
8,12,24,25
8,13,20,28
8,13,21,27
8,13,22,26
8,13,23,25
8,14,19,28
8,14,20,27
8,14,21,26
8,14,22,25
8,14,23,24
8,15,18,28
8,15,19,27
8,15,20,26
8,15,21,25
8,15,22,24
8,16,17,28
8,16,18,27
8,16,19,26
8,16,20,25
8,16,21,24
8,16,22,23
8,17,18,26
8,17,19,25
8,17,20,24
8,17,21,23
8,18,19,24
8,18,20,23
8,18,21,22
8,19,20,22
9,10,22,28
9,10,23,27
9,10,24,26
9,11,21,28
9,11,22,27
9,11,23,26
9,11,24,25
9,12,20,28
9,12,21,27
9,12,22,26
9,12,23,25
9,13,19,28
9,13,20,27
9,13,21,26
9,13,22,25
9,13,23,24
9,14,18,28
9,14,19,27
9,14,20,26
9,14,21,25
9,14,22,24
9,15,17,28
9,15,18,27
9,15,19,26
9,15,20,25
9,15,21,24
9,15,22,23
9,16,17,27
9,16,18,26
9,16,19,25
9,16,20,24
9,16,21,23
9,17,18,25
9,17,19,24
9,17,20,23
9,17,21,22
9,18,19,23
9,18,20,22
9,19,20,21
10,11,20,28
10,11,21,27
10,11,22,26
10,11,23,25
10,12,19,28
10,12,20,27
10,12,21,26
10,12,22,25
10,12,23,24
10,13,18,28
10,13,19,27
10,13,20,26
10,13,21,25
10,13,22,24
10,14,17,28
10,14,18,27
10,14,19,26
10,14,20,25
10,14,21,24
10,14,22,23
10,15,16,28
10,15,17,27
10,15,18,26
10,15,19,25
10,15,20,24
10,15,21,23
10,16,17,26
10,16,18,25
10,16,19,24
10,16,20,23
10,16,21,22
10,17,18,24
10,17,19,23
10,17,20,22
10,18,19,22
10,18,20,21
11,12,18,28
11,12,19,27
11,12,20,26
11,12,21,25
11,12,22,24
11,13,17,28
11,13,18,27
11,13,19,26
11,13,20,25
11,13,21,24
11,13,22,23
11,14,16,28
11,14,17,27
11,14,18,26
11,14,19,25
11,14,20,24
11,14,21,23
11,15,16,27
11,15,17,26
11,15,18,25
11,15,19,24
11,15,20,23
11,15,21,22
11,16,17,25
11,16,18,24
11,16,19,23
11,16,20,22
11,17,18,23
11,17,19,22
11,17,20,21
11,18,19,21
12,13,16,28
12,13,17,27
12,13,18,26
12,13,19,25
12,13,20,24
12,13,21,23
12,14,15,28
12,14,16,27
12,14,17,26
12,14,18,25
12,14,19,24
12,14,20,23
12,14,21,22
12,15,16,26
12,15,17,25
12,15,18,24
12,15,19,23
12,15,20,22
12,16,17,24
12,16,18,23
12,16,19,22
12,16,20,21
12,17,18,22
12,17,19,21
12,18,19,20
13,14,15,27
13,14,16,26
13,14,17,25
13,14,18,24
13,14,19,23
13,14,20,22
13,15,16,25
13,15,17,24
13,15,18,23
13,15,19,22
13,15,20,21
13,16,17,23
13,16,18,22
13,16,19,21
13,17,18,21
13,17,19,20
14,15,16,24
14,15,17,23
14,15,18,22
14,15,19,21
14,16,17,22
14,16,18,21
14,16,19,20
14,17,18,20
15,16,17,21
15,16,18,20
15,17,18,19

太多了 是写程序算出来的 希望对你有帮助