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phanvantanquang
2 năm trước
Cho hình chữ nhật ABCD có AB=12cm, BC=9cm. Gọi H là chân đường vuông góc kẻ từ A đến BD a) Chứng minh: ADH đồng dạng với BDA và ABH đồng dạng với BDC b) Tính BD c) Tính diện tích tam giác ABH
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