Question

Cho tam giác ABC, M thuộc AC sao cho \(\overrightarrow{MA}=-2\overrightarrow{MC}\), N thuộc BM sao cho \(\overrightarrow{NB}=-3\overrightarrow{NM}\), P thuộc BC sao cho \(\overrightarrow{PB}=k\overrightarrow{PC}\). Tìm k để ba điểm A,N,P thẳng hàng. 

Answer 1

Ta có:

\(\vec{AN}=\vec{AM}+\vec{MN}\)

\(=\dfrac{2}{3}\vec{AC}+\dfrac{1}{4}\vec{MB}\)

\(=\dfrac{2}{3}\vec{AC}+\dfrac{1}{4}\left(\vec{AB}-\vec{AM}\right)\)

\(=\dfrac{1}{4}\vec{AB}+\dfrac{1}{2}\vec{AC}\)

\(\vec{AP}=\vec{AC}+\vec{CP}\)

\(=\vec{AC}+\dfrac{1}{k+1}\vec{CB}\)

\(=\vec{AC}+\dfrac{1}{k+1}\left(\vec{AB}-\vec{AC}\right)\)

\(=\dfrac{1}{k+1}\vec{AB}+\dfrac{k}{k+1}\vec{AC}\)

A, N, P thẳng hàng khi:

\(\dfrac{\dfrac{k}{k+1}}{\dfrac{1}{k+1}}=\dfrac{\dfrac{1}{2}}{\dfrac{1}{4}}\Leftrightarrow k=2\)

Kết luận: \(k=2\)