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sunrise28081988
2 năm trước
Cho tam giác ABC vuông tại A, có đường cao AH. Biết AB=9cm, AC=12cm. a, Tính độ dài đoạn thẳng BC b, Chứng minh: tam giác ABC ~ tam giác HAC c, Gọi E, F là hình chiếu của H trên AB, AC. Chứng minh AH bình phương = AF. AC d, Tính diện tích tam giác AEF
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