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cho hình chữ nhật abcd có ab bằng 10 cm ad bằng 6 cm kẻ ah song song với bd m , n ,I lần lượt là trung điểm của ah , dh,bc a tính diện tích abd b chứng minh mn song song với ad c chứng minh tứ giác BINM là hình bình hành
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