<html><head><title>Bài tập trắc nghiệm</title><meta charset="utf-8"></head><body><center><table border="0"><tr><th><iframe src="https://drive.google.com/file/d/1ifudRDUEW3j-Ucmk8M9zsqLYwkwHvi8s/preview" width="1000" height="600" frameborder="0" marginheight="0" marginwidth="0">Đang tải…</iframe></th><th>ocs.google.com<iframe src="https://docs.google.com/forms/d/e/1FAIpQLScmaF6XpQYIntTPhahPD74Oc_afdP04n-Am8Uc-cu-uT9dQUw/viewform?embedded=true" width="360" height="580" frameborder="0" marginheight="0" marginwidth="0">Đang tải…</iframe><center><font color="blue">Giáo viên: Vũ Xuân Chiến </font></center></th></tr></table></center></body></html>