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19 tháng 11 2017

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11 tháng 12 2015

Câu C

Đúng nhất !!!

19 tháng 11 2017

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2 tháng 1 2018

bui tien dung bấm tào  lao

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,