Question

Calculati produsul scalar al vectorilor a si b daca

Answer 1

Răspuns:

   

a) → →

    a(3,1)   b(0,5)

→→

axb=(3,1)x(0,5)=3x0+1x5=5

b)  →          →

       a(2,-4)   b(6,2)

→→

axb=(2,-4)x(6,2)=2x6+(-4)x2=12-8=4

c) →                   →

      a(rad2, 3)   b(3rad2, 1)

→→

axb=(rad2, 3)x(3rad2, 1)= rad2x3rad2+3x1=6+1=7

d) →           →

       a(-8, 2/3)   b(3/4, 9)

→→

axb=(-8, 2/3)x(3/4, 9)=(-8)x3/4+2/3x9=(-6)+6=0

Explicație pas cu pas: