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bts203
2 năm trước
Cho ABC có góc A = 1v. Trên AC lấy điểm M sao cho AM < MC. Vẽ đường tròn tâm O đường kính CM cắt BC tại E;đường thẳng BM cắt (O) tại D;AD kéo dài cắt (O) tại S. a.C/m: 4 điểm B,A,D,C cùng thuộc một đường tròn. b. Cho BC cắt (O) ở E. Cmr:MD là phân giác của . c.C/m CA là phân giác của góc BCS
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