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anhton8512
2 năm trước
cho xoy = 90 độ và điểm a nằm bên trong góc đó .kẻ ab vuông góc với ox (b thuộc ox),ac vuông góc với oy (c thuộc oy ) a) Chứng minh AB//Oy ,AC//Ox b) Tính số đo góc BAC c) Lấy điểm N nằm trong góc xOy sao cho NAC = 90 độ (N và B nằm về hai phía của điểm A) .Chứng minh B,A,N thẳng hàng CÁC BẠN GIÚP MÌNH VỚI MAI KT GIỮA KÌ RÙI.....
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