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duongngoc12102000
2 năm trước
Cho hình bình hành ABCD . Gọi H và K lần lượt là hình chiếu của A và C trên đường chéo BD a) Chứng minh : AHCK là hình bình hành b) Gọi O là trung điểm của HK. Chứng minh: A đối xứng với C qua O
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