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quynh2018
2 năm trước
Vẽ hình theo cách diễn đạt sau: (Có điểm A cho ttrước) -Vẽ $\widehat{xOy}=$ $50^\circ$ -Trên đường thẳng Oy lấy điểm C bất kì -Từ C kẻ CE⊥Ox -Từ điểm A cho trước kẻ AH⊥Ox -Nối C với H
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