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bichthuyav
2 năm trước
Cho ∆ABC và P,Q thỏa mãn: $\vec{PA}$+5$\vec{PC}$=$\vec{0}$ Và $\vec{QA}$+3$\vec{QB}$+5$\vec{QC}$=$ \vec{0} $ CM: P,Q,B thẳng hàng
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