102533 ***************************
![102533 class=](https://ro-static.z-dn.net/files/d2f/dca2e421e9337fee0dac7e7dcfa8e327.jpg)
Le luam la rand:
a) MA-MB=AB
MA+BM=AB
BM+MA=AB
BA=AB -fals
b) NA-NB=BA
NA+BN=BA
BN+NA=BA
BA=BA -adevarat
Deci varianta b) este cea corecta. Nu uita sa pui vectori,eu nu i-am mai pus.