Question

URGENT Ofer 40 de puncte pentru cele 2 exercitii + coroana

Answer 1

xG=(1+3+2)/3=6/3=2
yG=(2+1-1)/3=2/3
G(2;2/3)


cosα=a*b/|a|*|b|=(3*1-2*4)/√(9+4) *√(1+16)=(3-8)/√13 *√17=-5/√221=
-5√221/221