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sang3108
2 năm trước
tam giác ABC vuông tại A, tia phân giác góc B, góc C cắt nhau ở I. D và E lần lượt là chân đường vuông góc kẻ từ I đến AB và AC. a) C/M : AD = AE b) tính độ dài các đoạn AD,AE bt AB = 6cm , AC = 8 cm
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