DD
0
K
Khách
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QL
0
LM
15 tháng 9 2019
Ta thấy 3 điểm B,C,D thẳng hàng
3 điểm B,A,C thẳng hàng
=> B,C,D,B,A,C NẰM CÙNG MỘT HÀNG
=> B,C,D,A NẰM CÙNG MỘT HÀNG
=> B,A,D CÓ THẲNG HÀNG
LM
15 tháng 9 2019
Vì qua hai điểm ta vẽ được một đường thẳng nên ta vẽ được các đường thẳng : AB,AC,AD,BC,BD,CD.AB,AC,AD,BC,BD,CD.
Có tất cả 6 đường thẳng.
3 điểm B,A,D ko thẳng hàng(xem hình)
DT
1
19 tháng 11 2017
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