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momo8102002
2 năm trước
Cho ABC. Trên tia đối của tia BC lấy điểm E sao cho EB = BA. Trên tia đối của tia CB lấy điểm F sao cho FC = CA. Qua E kẻ đường thẳng song song với AB, qua F kẻ đường thẳng song song với AC, hai đường thẳng này cắt nhau tại P. a) Chứng minh EA là tia phân giác của góc PEB , FA là tia phân giác của góc PFC b) PA kéo dài cắt BC tại Q. Chứng minh AQ là tia phân giác của góc BAC.
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