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nhokpancf
2 năm trước
Cho hình thang ABCD (AB=CD,AB<CD) tia phân giác của góc A và D cắt nhau ở I, tia phân giác của góc B vàC cắt nhau ở K a chứng minh AI vương góc vs DI, BK vUông gics với CK b gọi E là giao điểm của Bk và AI gia E thuộc CD
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