Question

Va rog mult sa ma ajutați, ​

Answer 1

Răspuns:

a) XY + YZ + ZX = 0 ( vector la toate)

XY(vector) + YZ ( vector) = XZ ( vector)

XZ(vector) + ZX(vector) = XX(vector) = 0(vector)

-> XY(vector) + YZ(vector) + ZX(vector) = 0(vector)

b) MN + NP + PQ + QM = 0 ( vector la toate)

Grupam : MN( vector) + NP( vector) = MP ( vector) - regula triunghiului

PQ( vector) + QM(vector) = PM ( vector )

MP ( vector) + PM (vector) = MM ( vector) = 0

-> MN (vector) + NP (vector) + PQ ( vector) + QM(vector) = 0(vector)

Am folosit numai regula triunghiului!