解析 解:(1)与a平行的单位向量是:±(a)/(|a|)=±(6i+2j-3k)/7=±(6/7i+2/7j-3/7k);(2)与a同向的单位向量是:(a)/(|a|)=6/7i+2/7j-3/7k. (1)与a平行的单位向量为:±(a)/(|a|),求出|a|并代入a=6i+2j-3k即可;(2)与a同向的单位向量为:(a)/(|a|)....
百度试题 题目中国大学MOOC: 设a=i-2j-3k,b=2i+j-k,则。 相关知识点: 试题来源: 解析 对 反馈 收藏
Over the past couple of years, I've accumulated bookmarks, saved Reddit posts, and GitHub stars all related to piracy in some form or another. This list is my attempt to add structure to those resources and share them. Everything you need to get started on your pirate voyage can be ...
git clone https://github.com/tornadoweb/tornado PyPi (📥 41M / month · 📦 3K · ⏱️ 29.11.2023): pip install tornado Conda (📥 42M · ⏱️ 19.02.2024): conda install -c conda-forge tornado sanic (🥈41 · ⭐ 18K) - Accelerate your web app development | Build ...
a-b = (i-3i) + (-2j+2j) + (-3k+k) = -2i-2k
所求平面与a和b都平行，则与a、b组成的平面平行，则所求平面法向量与ab平面法向量平行，所以求出a、b的向量积，即为法向量，再带入点（1,2,1），即可求出点法式方程
2009;2(5–6):231–7. Article CAS Google Scholar Alberti KG, et al. Harmonizing the metabolic syndrome: a joint interim statement of the International Diabetes Federation Task Force on Epidemiology and Prevention; National Heart, Lung, and Blood Institute; American Heart Association; World Heart...
百度试题 结果1 题目 6.若 a=-i+2j-k_1 ,b=-3i+6j-3k,c=-2i+4j-2k,则 a 、(D) A.可组成锐角三角形; B.可组成直角三角形; C.可组成钝角三角形; D.不构成三角形. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
proxy update -fWindowsFor example proxy placed in c:\gp\proxy.c:\ cd gp proxy updateForce update.c:\ cd gp proxy update -fLicenseProxy is licensed under GPLv3 license.ContactOfficial Telegram Group: goproxySource code declarationThe author of this project found that a large number of ...
解：设与a，b都垂直的向量为c，则：∣i j k∣ c=a×b=∣1 2 1∣=(-6-1)i-(-3-2)j+(1-4)k=-7i+5j-3k ∣2 1 -3∣ ∣c∣=√(49+25+9)=√83 故垂直于a，b的单为向量为(1/√83)c=(1/√83)(-7i+5j-3k)...