25 |
24 |
3 |
8 |
1 |
6 |
3 |
4 |
12 |
13 |
25 |
24 |
3 |
8 |
1 |
6 |
3 |
4 |
25 |
24 |
25 |
24 |
5 |
24 |
5 |
24 |
12 |
13 |
1 |
13 |
1 |
13 |
2 |
5 |
4 |
5 |
5 |
21 |
3×2 |
2×1 |
m(m-1)…(m-n+1) |
n(n-1)×…×3×2×1 |
7×6×5×4×3 |
5×4×3×2×1 |
A.20158.4元 | B.20198元 | C.20396元 | D.20316.8元 |
2 |
3 |
8 |
5 |
1 |
2 |
1 |
2 |
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