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Bài 5: Cho tam giác ABC , kẻ tia phân giác Bx của góc B, Bx cắt AC tại M. Từ M kẻ đường thẳng song song với AB, nó cắt BC tại N. Từ N kẻ tia Ny song song với Bx. Chứng minh rằng: a) Góc xBC = góc BMN b) Tia Ny là tia phân giác của góc MNC. helpppppppppppppppppppppp
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