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bichly1010
2 năm trước
Cho hình bình hành ABCD , AB > BC , phân giác góc D và góc B cắt AB,CD thứ tự tại E và F C/m a) DE // BF b) tứ giác DEBF là hình bình hành Mn giúp mình với mình cần gấp ạ :((
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