高数课程妥媒血课件 镭理工大理>> 向量的加减法、向量与数的乘积等的坐标表达式 x 5 }b={ x 2 b,b2} a+b=a+b, a,+b,, a,+b, (a+br)i+(a,+bwj+(a, +b,k b=a-b, a-b (ax-b)i+(av -)j+(az -bk M={-,1,Man} =()i+(avj+(a, k Http://www.heut.edu.cn向量的加减法、向量与数的乘积等的坐标表达式 { , , } x y z a = a a a  { , , } b = bx by bz  { , , } a + b = ax + bx ay + by az + bz   { , , } a − b = ax − bx ay − by az − bz   { , , } a = ax ay az  ax bx i ay by j az bz k    = ( + ) + ( + ) + ( + ) ax bx i ay by j az bz k    = ( − ) + ( − ) + ( − ) ax i ay j az k    = ( ) + ( ) + ( )