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498622597741922
2 năm trước
giúp mik nha Cho hình chữ nhật ABCD có AB=20cm;BC=15cm. gọi H là chân đường vuông góc kẻ từ A đến BD a, chứng minh tam giác AHB đồng dạng với tam giác BCD b, chứng minh AH.BD=BC.AB. từ đó tính AH c, tính diện tích tam giác AHB
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