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ngocdiepcute
2 năm trước
Giúp mình với!! Cho hình thang vuông ABCD ( Â = góc D= 90 độ). Gọi E là điểm đối xứng với C qua AD, I là giao điểm của BE với AD. a) Chứng minh ID là tia phân giác của góc CIE b) Tia CI cắt AB ở F. Chứng minh F đối xứng với B qua AD
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