... Ta cú ADC = BDC (Đối đỉnh) CAD = DBE (2 gúc ni tip cựng chn cung CE) nờn ACD BDE AD DB ị = ị AD .DE = DB.DChay DC DE ữ ữ < ữ ữ n + 1ứ C a E AD(AE-AD) = DB.DC Hay AD2 = AD.AE - DB.DC=AB.AC DB.DC...
... is the most excellent student in this college A B C D Câu 14: He decided to see the doctor, that is a good idea A B C D Câu 15: Protecting the environment is the duty of people live anywhere ... Before the telephone invented by Alexander Graham Bell in 1876, it was hard for people (31)……over long distances They wrote letters to each other It could take days or even weeks for letters to ... even weeks for letters to be (32)……Then people learned how (33)…… telegraph messages The messages traveled as electric signals that represented a code of dots and dashes An operator on the other...