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nguyenmai11101975
2 năm trước
cho hình bình hành ABCD (A>90).Gọi H và K lần lượt là hình chiếu của A và C lên BD . M là giao của AB với CK ;N là giao của CD với AH chứng minh a) AHCK là hình bình hành b) MN;HK;AC đồng quy vẽ hình nha
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