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nmp01012003
2 năm trước
Cho tam giác ABC vuông tại A. Lấy điểm M thuộc cạnh BC sao cho BM=AB. Vẽ tia phân giác BD ( D thuộc cạnh AC ) của góc B, BD cắt AM tại H. Chứng minh rằng : a/ ∆ABH=∆MBH b/ Tia DB là tia phân giác của ADM c/ Kéo dài DM cắt AB tại k. Chứng minh AK=MC và BD ⊥ CK
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