\[\boxed{\mathbf{595.}ОК\ ГДЗ\ –\ домашка\ на\ 5}\]
\[Для\ сложения\ векторов,\ \]
\[воспользуемся\ правилом\ \]
\[параллелепипеда.\]
\[\textbf{а)}\ \overrightarrow{\text{AB}} + \overrightarrow{\text{AD}} + \overrightarrow{AA_{1}} = \overrightarrow{AC_{1}}.\]
\[\textbf{б)}\ \overrightarrow{\text{DA}} + \overrightarrow{\text{DC}} + \overrightarrow{DD_{1}} = \overrightarrow{DB_{1}}.\]
\[\textbf{в)}\ \overrightarrow{A_{1}B_{1}} = \overrightarrow{\text{DC}};\ \ \overrightarrow{C_{1}B_{1}} = \overrightarrow{\text{DA}};\ \ \]
\[\overrightarrow{BB_{1}} = \overrightarrow{DD_{1}}:\]
\[\overrightarrow{A_{1}B_{1}} + \overrightarrow{C_{1}B_{1}} + \overrightarrow{BB_{1}} =\]
\[= \overrightarrow{\text{DC}} + \overrightarrow{\text{DA}} + \overrightarrow{DD_{1}} = \overrightarrow{DB_{1}}.\]
\[\textbf{г)}\ \overrightarrow{\text{AB}} = \overrightarrow{A_{1}B_{1}}:\]
\[\overrightarrow{A_{1}A} + \overrightarrow{A_{1}D_{1}} + \overrightarrow{\text{AB}} =\]
\[= \overrightarrow{A_{1}A} + \overrightarrow{A_{1}D_{1}} + \overrightarrow{A_{1}B_{1}} = \overrightarrow{A_{1}C}.\]
\[\textbf{д)}\ \overrightarrow{B_{1}A_{1}} = \overrightarrow{\text{BA}}:\]
\[\overrightarrow{B_{1}A_{1}} + \overrightarrow{BB_{1}} + \overrightarrow{\text{BC}} =\]
\[= \overrightarrow{\text{BA}} + \overrightarrow{BB_{1}} + \overrightarrow{\text{BC}} = \overrightarrow{BD_{1}}.\]