Phat bieu nao dung, phat bieu nao sai?
1/ Co duy nhat mot duong thang di qua 2 diem cho truoc.
2/ Doan thang AB la hinh gom tat ca cac diem nam giua 2 diem A va B
3/ Co 3 diem M, A, B, neu co MA = MB thi M la trung diem cua doan thang AB
K
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19 tháng 11 2017
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24 tháng 9 2017
A) Sai vì hai đường thẳng cùng song song với một đường thẳng thì chúng có thể trùng nhau.
B) Sai vì có vô số đường thẳng song song với đường thẳng đã cho.
C) Đúng.
D) Sai vì trong A,B,C có 1 câu đúng.
18 tháng 9 2015
a)hinh tao thanh boi diem O va 1 phan duong thang bi chia ra boi diem Oduoc goi la 1 tia gốc O
b)diem R bat ki nam tren duong thang xy la goc chung cua 2 tia đối nhau
c)neu diem A nam giua 2 diem B va C thi:
-hai tia......AB và CA........doi nhau
-hai tia CA va ..........CB.............trung nhau
-hai tia BAva BC ........trùng nhau......
bạn nhấn đúng cho mình nhé , cảm ơn,
1/ đúng
2/ đúng
3/sai thiếu điều kiện M,A,B thẳng hàng