Question

mong mọi người giúp em ạ !

Answer 1

\(\overrightarrow{AB}-\overrightarrow{DC}+\overrightarrow{BC}-\overrightarrow{AD}=\left(\overrightarrow{AB}+\overrightarrow{BC}\right)-\left(\overrightarrow{AD}+\overrightarrow{DC}\right)\)

\(=\overrightarrow{AC}-\overrightarrow{AC}=\overrightarrow{0}\)