Giúp mình với (vẽ hình ghi gt,ko nx nhe) Cho góc xAy khác góc bẹt, trên tia Ax lấy điểm M, trên tia Ay lấy điểm N sao cho AM = AN. Trên tia Mx lấy điểm E, trên tia Ny lấy điểm F sao cho ME = MF a Chứng minh MF = NE b Gọi I là giao điểm của MF và NE. Chứng minh tam giác IME = tam giác INF c Chứng minh AI vuông góc với MN

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