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tvanh1103
2 năm trước
Cho tam giác ABC nhọn ,AH vuông BC sao cho AH=BH=2CH.Kẻ BK vuông AC,BK cắt AH ở I.Lấy M là trung điểm HI.CM cắt AB ở N.Cho diện tích tam giác ABC là 3 cm^2. a)Tính số đo các góc của tam giác ABC b)Tính AN
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