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langvantruong18
2 năm trước
Cho hình thang ABCD có góc A=B=90 độ và BC=AB=AD/2. Lấy điểm M thuộc đáy nhỏ BC. Kẻ Mx vuông góc với MA, Mx cắt CD tại N. Chứng minh rằng tam giác AMN vuông cân(mik chưa học hình bình hành,đường trung bình và các bài sau đó )
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