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Cho tam giác ABC vuông tại A, ABC =30 độ. Tia phân giác của góc ACB cắt cạnh AC tại M. Hạ MH vuông góc với BC tại H a) Chứng minh : ∆ACM = ∆HCM. b) Chứng minh tam giác BMC cân. c) Chứng minh : AB=½.BC d) Kéo dài MH cắt AC tại E. Chứng minh tam giác BCE là tam giác đều.
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