Tính
B
2
2
3
⋅
3
2
8
⋅
4
2
15
⋅
5
2
24
⋅
6
2
35
⋅
7
2
48
⋅
8
2
63
⋅...
Đọc tiếp
Tính B = 2 2 3 ⋅ 3 2 8 ⋅ 4 2 15 ⋅ 5 2 24 ⋅ 6 2 35 ⋅ 7 2 48 ⋅ 8 2 63 ⋅ 9 2 80 ta được
A. 9 5
B. 3 5
C.3
D. 6 5