cho tam giác abc tìm tap hop diem cua H,K thỏa
\(^{\left|3\overrightarrow{HA}-2\overrightarrow{HB}+\overrightarrow{HC}\right|=\left|\overrightarrow{HA}-\overrightarrow{HB}\right|}\)
\(2\left|\overrightarrow{KA}+\overrightarrow{KB}+\overrightarrow{KC}\right|=3\left|\overrightarrow{KB}+\overrightarrow{KC}\right|\)