L
linh3


o vi du 2 loai 1 dang bai toan thuan tuy
tao sao thay lai ko gan truc luon vao mat phang (ABC)?
Khi do :A(o,o,o)
giup mjnh voi
tao sao thay lai ko gan truc luon vao mat phang (ABC)?
Khi do :A(o,o,o)
giup mjnh voi