Nhung kho khan trong giai bai tap hoa vo co
vo co la mot mon tuong doi kho, can su tuong tuong cao ve cau truc khong gian,vi the ma ban can read ky bai chu y quan sat tung vi du cu the de van dung vao trong chinh bai minh dang lam.Phai can trong vi rat de nham ,can use all your skill.dao la loi khuyen cua minh
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