Question

Cho hình hộp ABCD.EFGH. Tìm các vectơ:

a) \(\overrightarrow{DA}+\overrightarrow{DC}+\overrightarrow{DH}\).                       b) \(\overrightarrow{HE}+\overrightarrow{GC}+\overrightarrow{AB}\).

Answer 1

a) \(\overrightarrow {DA}  + \overrightarrow {DC}  + \overrightarrow {DH}  = \overrightarrow {DB}  + \overrightarrow {DH}  = \overrightarrow {DF} \)

b) \(\overrightarrow {HE}  + \overrightarrow {GC}  + \overrightarrow {AB}  = \overrightarrow {HE}  + \overrightarrow {HD}  + \overrightarrow {HG}  = \overrightarrow {HB} \)