三维向量的向量积运算公式(B008)

问题

若向量 $\vec{a}$ $=$ $(x_{1}, y_{1}, z_{1})$, $\vec{b}$ $=$ $(x_{2}, y_{2}, z_{2})$, $\vec{c}$ $=$ $(x_{3}, y_{3}, z_{3})$, 向量 $\mathbf{\vec{i}}$, $\mathbf{\vec{j}}$, $\mathbf{\vec{k}}$ 分别是 $x$ 轴、$y$ 轴和 $z$ 轴上的单位向量,则向量积 $\vec{a}$ $\times$ $\vec{b}$ $=$ $?$

选项

[A].   $\vec{a}$ $\times$ $\vec{b}$ $=$ $\begin{vmatrix} x_{1} & z_{1} \\ x_{2} & z_{2} \end{vmatrix} \mathbf{i}$ $-$ $\begin{vmatrix} y_{1} & z_{1} \\ y_{2} & z_{2} \end{vmatrix} \mathbf{j}$ $+$ $\begin{vmatrix} x_{1} & y_{1} \\ x_{2} & y_{2} \end{vmatrix} \mathbf{k}$

[B].   $\vec{a}$ $\times$ $\vec{b}$ $=$ $\begin{vmatrix} y_{1} & z_{1} \\ y_{2} & z_{2} \end{vmatrix} \mathbf{i}$ $+$ $\begin{vmatrix} x_{1} & z_{1} \\ x_{2} & z_{2} \end{vmatrix} \mathbf{j}$ $-$ $\begin{vmatrix} x_{1} & y_{1} \\ x_{2} & y_{2} \end{vmatrix} \mathbf{k}$

[C].   $\vec{a}$ $\times$ $\vec{b}$ $=$ $\begin{vmatrix} y_{1} & z_{1} \\ y_{2} & z_{2} \end{vmatrix} \mathbf{i}$ $+$ $\begin{vmatrix} x_{1} & z_{1} \\ x_{2} & z_{2} \end{vmatrix} \mathbf{j}$ $+$ $\begin{vmatrix} x_{1} & y_{1} \\ x_{2} & y_{2} \end{vmatrix} \mathbf{k}$

[D].   $\vec{a}$ $\times$ $\vec{b}$ $=$ $\begin{vmatrix} y_{1} & z_{1} \\ y_{2} & z_{2} \end{vmatrix} \mathbf{i}$ $-$ $\begin{vmatrix} x_{1} & z_{1} \\ x_{2} & z_{2} \end{vmatrix} \mathbf{j}$ $+$ $\begin{vmatrix} x_{1} & y_{1} \\ x_{2} & y_{2} \end{vmatrix} \mathbf{k}$


上一题 - 荒原之梦   答 案   下一题 - 荒原之梦

$\textcolor{red}{\vec{a}}$ $\textcolor{green}{\times}$ $\textcolor{red}{\vec{b}}$ $=$

$\begin{vmatrix}\mathbf{\textcolor{orange}{i}} & \mathbf{\textcolor{orange}{j}} & \mathbf{\textcolor{orange}{k}} \\ x_{\textcolor{cyan}{1}} & y_{\textcolor{cyan}{1}} & z_{\textcolor{cyan}{1}} \\ x_{\textcolor{blue}{2}} & y_{\textcolor{blue}{2}} & z_{\textcolor{blue}{2}} \end{vmatrix}$ $=$

$\begin{vmatrix} y_{\textcolor{cyan}{1}} & z_{\textcolor{cyan}{1}} \\ y_{\textcolor{blue}{2}} & z_{\textcolor{blue}{2}} \end{vmatrix} \mathbf{\textcolor{orange}{i}}$ $\textcolor{green}{-}$ $\begin{vmatrix} x_{\textcolor{cyan}{1}} & z_{\textcolor{cyan}{1}} \\ x_{\textcolor{blue}{2}} & z_{\textcolor{blue}{2}} \end{vmatrix} \mathbf{\textcolor{orange}{j}}$ $\textcolor{green}{+}$ $\begin{vmatrix} x_{\textcolor{cyan}{1}} & y_{\textcolor{cyan}{1}} \\ x_{\textcolor{blue}{2}} & y_{\textcolor{blue}{2}} \end{vmatrix} \mathbf{\textcolor{orange}{k}}$


荒原之梦网全部内容均为原创,提供了涵盖考研数学基础知识、考研数学真题、考研数学练习题和计算机科学等方面,大量精心研发的学习资源。

豫 ICP 备 17023611 号-1 | 公网安备 - 荒原之梦 豫公网安备 41142502000132 号 | SiteMap
Copyright © 2017-2024 ZhaoKaifeng.com 版权所有 All Rights Reserved.

Copyright © 2024   zhaokaifeng.com   All Rights Reserved.
豫ICP备17023611号-1
 豫公网安备41142502000132号

荒原之梦 自豪地采用WordPress