Question

sendo a = (3/5 2/1) e b=(3/2 -1/0) e c=(1/4), calcule: a) ab b) Ac c) bc

Answer 1

vAB = vetor AB: 

vAB = B - A 
vAB = (-2,-1,-1) - (2,3,4) 
vAB = (-4,-4,-5) 

vAC = C - A 
vAC = (-2,-1,-2) - (2,3,4) 
vAC = (-4, -4, -6) 

vBC = C - B 
vBC = (-2,-1,-2) - (-2,-1,-1) 
vBC = (0, 0, -1)