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2 năm trước
Cho tam giác ABC vuông tại A, ABC 30   . 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 1/2.AB BC  . d) Kéo dài MH cắt AC tại E. Chứng minh tam giác BCE là tam giác đều.
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