Cho tam giác ABC. Trên cạnh AB lấy điểm M sao cho AM = AB. Trên cạnh AC lấy điểm N sao cho AN = AC. Hai đoạn thẳng BN và CM cắt nhau tại O. Biết diện tích tam giác AOC bằng 24 cm2. 1) Tính diện tích tam giác AOB? 2) Tính tỷ số ON/OB Giải chi tiết+vẽ hình Không giải hết bài=báo cáo

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