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kephasan01
2 năm trước
Mọi người giúp mình giải bài này gấp nha: Cho tam giác ABC vuông tại A (AB < AC). Gọi D là trên cạnh BC sao cho BD = AB. Đường thẳng vuông góc với BC tại D, đường thẳng này cắt cạnh AC tại M và cắt tia BA tại N. a/ Chứng minh: tam giác ABM =tam giác DBM. b/ Chứng minh: tam giác MCN cân. c/ Chứng minh: AD // CN. d/ Vẽ MK vuông góc với CN tại K. Chứng minh: Ba điểm B, M, K thẳng hàng
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