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ptt8996
2 năm trước
cho hình chữ nhật ABCD, có AB=12, AD=9(cm). H là chân đường vuông góc kẻ từ A xuống BD a. cm AD ²=HD. BD b.tính HD và HB c.tia phân giác góc ADB cắt AH tại E và AB tại F. chứng tỏ EH/EA= FA/FB
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