Question

求平行于向量a=4i-3k的单位向量?

Answer 1

a=4i-3k=(4,0,-3),|a|=5,则a的单位向量：a0=a/|a|=(4,0,-3)/5

故所求单位向量为a0=(4,0,-3)/5或-a0=(-4,0,3)/5