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lengocbichpm
2 năm trước
Cho ∆ABC có AB=AC và BC<AB, gọi M là trung điểm của BC. a)Chứng minh:∆ABM=∆ACM và AM là tia phân giác của góc BAC b) Trên cạnh AB lấy điểm D sao cho CB =CD. Kẻ tia phân giác của góc BCD, tia này cắt cạnh BD tại N. Chứng minh:CN vuông góc với BD c) Trên tia đối tia CA lấy điểm E sao cho AD =CE . Chứng minh :BE-CE=2BN Nhớ vẽ hình, ko được spam mình sẽ vote 5
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