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anhhoanglss2002
2 năm trước
mọi người giúp mình với.mình cảm ơn. cho tam giác cân abc, có góc A=45độ;AB=AC. từ trung điểm i của cạnh AC kẻ đường vuông góc với AC cắt đường thẳng BC ở M.trên tia đối của tia AM lấy điểm N sao cho AN=BM.chứng minh rằng: a)góc ABC = góc BAC. tam giác ABM=tam giác CAN. tam giác MNC vuông cân ở C.
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