ГДЗ по геометрии 7 класс Атанасян Задание 1044

\[\boxed{\mathbf{1044.ОК\ ГДЗ - домашка\ на}\ 5}\]

\[Решение.\]

\[\textbf{а)}\ \overrightarrow{a}\left\{ \frac{1}{4}; - 1 \right\};\ \overrightarrow{b}\left\{ 2;3 \right\}:\]

\[\overrightarrow{a} \bullet \overrightarrow{b} = \frac{1}{4} \bullet 2 + ( - 1) \bullet 3 = \frac{1}{2} - 3 =\]

\[= - 2,5.\]

\[\textbf{б)}\ \overrightarrow{a}\left\{ - 5;6 \right\};\ \overrightarrow{b}\left\{ 6;5 \right\}:\]

\[\overrightarrow{a} \bullet \overrightarrow{b} = - 5 \bullet 6 + 6 \bullet 5 =\]

\[= - 30 + 30 = 0.\]

\[\textbf{в)}\ \overrightarrow{a}\left\{ 1,5;2 \right\};\ \overrightarrow{b}\left\{ 4; - 0,5 \right\}:\]

\[\overrightarrow{a} \bullet \overrightarrow{b} = 1,5 \bullet 4 + 2 \bullet ( - 0,5) =\]

\[= 6 - 1 = 5.\]