prin metoda comparatiei va rog frymossssss


Prin Metoda Comparatiei Va Rog Frymossssss class=

Răspuns :

3a+7b=138/×4
4a+6b=134/×(-3)

12a+28b=552
-12a-18b=-402
/ 10b=150
b=150:10
b=15

3a+7×15=138
3a+105=138
3a=138-105
3a=33
a=33:3
a=11