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truong11081999
2 năm trước
Cho `\vec{u}, \vec{v} \ne \vec{0}` và cùng phương, các số a, b, c, d thỏa mãn: `a.\vec{u}+b.\vec{v}=\vec{0}` và `c.\vec{u}+d.\vec{v}=\vec{0}` CMR: `a/b=c/d`
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