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2 năm trước
Cho hình vuông ABCD, trên cạnh AB lấy E và trên cạnh AD lấy F sao cho AE =AF . Vẽ AH vuông góc với BF ( H thuộc BF) , AH cắt DC và BC lần lượt tại hai điểm M, N. a) CM: tam giác CBH đồng dạng tam giác EAH b) Biết diện tích tam giác BCH gấp bốn lần diện tích tam giác AEH. CMR: AC= 2EF ( bạn nào giỏi toán giúp mình với ạ. Mình cần gấp)
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