Какая из фомул верная? \(\vec a \vec b = x_1x_2+y_1y_2+z_1z_2\) \(\vec a \vec b = x_1x_2-y_1y_2-z_1z_2\) \(\vec a \vec b = x_1y_2+y_1z_2+z_1x_2\) \(\vec a \vec b = y_1z_2+x_1y_2+z_1x_2\) \(\vec a \vec b = x_1x_2-y_1y_2+z_1z_2\) \(\vec a \vec b = x_1x_2+y_1y_2-z_1z_2\)

Задание

Какая из фомул верная?

\(\vec a \vec b = x_1x_2+y_1y_2+z_1z_2\)
\(\vec a \vec b = x_1x_2-y_1y_2-z_1z_2\)
\(\vec a \vec b = x_1y_2+y_1z_2+z_1x_2\)
\(\vec a \vec b = y_1z_2+x_1y_2+z_1x_2\)
\(\vec a \vec b = x_1x_2-y_1y_2+z_1z_2\)
\(\vec a \vec b = x_1x_2+y_1y_2-z_1z_2\)