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Câu 5. Cho tứ giác ABCD có các tia phân giác của các góc A và D vuông góc với nhau tại E. a) Tứ giác ABCD là hình gì? Chứng minh. b) Các tia phân giác của các góc B và C cắt nhau tại F. Gọi M, N lần lượt là trung điểm của AD, BC. Chứng minh ME và FN song song AB.
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