LH
1
K
Khách
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NT
0
E
0
ND
1
TC
0
19 tháng 11 2017
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HT
0
Công thức tính số đường thẳng là:
\(\frac{n.\left(n-1\right)}{2}\) (N là số điểm)
Vậy tạo được: \(\frac{8.\left(8-1\right)}{2}=28\) đường