T
tn123
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
![](https://blog.hocmai.vn/wp-content/uploads/2017/07/hot.gif)
cho 6 diem a,b,c,d,e,f.cm rang
vecto AB+BE+CF=vecto AE+BF+CD= vecto AF+BD+CE
cac ban thong cam mjnh chua bit su dung may tònh
vecto AB+BE+CF=vecto AE+BF+CD= vecto AF+BD+CE
cac ban thong cam mjnh chua bit su dung may tònh