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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

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)



 

22 tháng 11 2016

vì B nằm giữa A và C nên

       AB+BC=AC

       5cm+2cm=AC

                       AC=7cm

               vậy AC=7cm

CHÚC BẠN HỌC GIỎI 

TK MÌNH NHÉ

8 tháng 11 2016

A,B,C thẳng hàng mà AC<AB => C nằm giữa A,B => CB=AB-AC=3-2=1CM Vì CB<CD =>  B nằm giữa C và D

19 tháng 11 2017

ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt