Câu hỏi:

\(\vec{a}=\left( -1;-4 \right)\)

\(\vec{a}=\left( 4;-1 \right)\)

\(\vec{a}=\left( -4;1 \right)\)

\(\vec{a}=\left( -1;4 \right)\)

\(\vec{c}=\left( -1;-4 \right)\)

\(\vec{c}=\left( 5;12 \right)\)

\(\vec{c}=\left( 2;5 \right)\)

\(\vec{c}=\left( 2;6 \right)\)

\({A}'\left( -2;-1 \right)\)

\({A}'\left( 1;2 \right)\)

\({A}'\left( -2;1 \right)\)

\({A}'\left( 2;-1 \right)\)

\(\overrightarrow{MN}=\left( 1;1 \right)\)

\(\overrightarrow{MN}=\left( 2;2 \right)\)

\(\overrightarrow{MN}=\left( 6;8 \right)\)

\(\overrightarrow{MN}=\left( -6;-8 \right)\)

\(I\left( 4;4 \right)\)

\(I\left( 2;2 \right)\)

\(I\left( 0;-10 \right)\)

\(I\left( 0;10 \right)\)

\(D\left( 4;3 \right)\)

\(D\left( 3;4 \right)\)

\(D\left( 4;4 \right)\)

\(D\left( 8;6 \right)\)

\(\vec{a}\cdot \vec{b}=1\)

\(\vec{a}\cdot \vec{b}=12\)

\(\vec{a}\cdot \vec{b}=7\)

\(\vec{a}\cdot \vec{b}=26\)

\({{0}^{\circ }}\)

\({{90}^{\circ }}\)

\({{180}^{\circ }}\)

\(\left( 0;3 \right)\)

\(\left( 0;-3 \right)\)

\(\left( -1;2 \right)\)

\(\left( 3;4 \right)\)

\({{\text{ }\!\!\Delta\!\!\text{ }}_{a}}=\left| a-\overline{a} \right|\)

\({{\text{ }\!\!\Delta\!\!\text{ }}_{a}}=\left| a+\overline{a} \right|\)

\({{\text{ }\!\!\Delta\!\!\text{ }}_{a}}=\left| a\cdot \overline{a}\right|\)

\({{\text{ }\!\!\Delta\!\!\text{ }}_{a}}=\left| \frac{\overline{a}}{a}\right|\)