Question

ras

請問這兩題怎麽解，感謝

已知a=(3,m,1), b=(1,-2,3),若axb=(8,-2,n) ,則m+n=?
n
图:6
已知行與a=(-1,-2,-3)及b=(3,4,5)同時垂直,且| |-4/6,則n=?
(4,8,4)或(-4,8,-4)

Answer 1

Wonder

如