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vuthiquynhanh23091810
2 năm trước
Cần hỏi gấp Tại sao cho hình bình hành `ABCD` mà ta lại có `\vec{AB}+\vec{AD}=\vec{AC}??` Nếu có cách chứng minh thì chứng minh hộ mình nha :3
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