Câu 19: \(\overrightarrow{AB}+\overrightarrow{BM}+\overrightarrow{NA}+\overrightarrow{BQ}\)
\(=\overrightarrow{AM}+\overrightarrow{NA}+\overrightarrow{MN}=\overrightarrow{NM}+\overrightarrow{MN}=\overrightarrow{0}\)
=>Chọn A
Câu 18: \(\overrightarrow{u}=\overrightarrow{AD}-\overrightarrow{CD}+\overrightarrow{CB}-\overrightarrow{DB}\)
\(=\overrightarrow{AD}+\overrightarrow{DC}+\overrightarrow{CB}+\overrightarrow{BD}=\overrightarrow{AC}+\overrightarrow{CB}+\overrightarrow{BD}\)
\(=\overrightarrow{AB}+\overrightarrow{BD}=\overrightarrow{AD}\)
=>Chọn B
Câu 17: \(\overrightarrow{MN}+\overrightarrow{PQ}+\overrightarrow{RN}+\overrightarrow{NP}+\overrightarrow{QR}\)
\(=\overrightarrow{RP}+\overrightarrow{QR}+\overrightarrow{PQ}+\overrightarrow{MN}=\overrightarrow{MN}+\overrightarrow{QP}+\overrightarrow{PQ}=\overrightarrow{MN}\)
=>Chọn B
Câu 15: B
Câu 14: C
Câu 13: B
Câu 12: A
