a+b+c= 340
a+b= b+ c+80
b= c+ 50
Rezolvare:
a+ b= c+50 ( Estte b am inlocuit) + c + 80
a + b = 2 c ( am adunat cei doi c ) + 130 (50+80)
a + b = 2 c + 130
a + c + 50 = 2c + 130
a= ( le ducem pe toate dupa egal ) 2c - c + 130 - 50
a= c + 80
( inlocuim in ecuatia: a + b = 340 - c )
c + 80 ( a ) + c + 50 ( b ) =340 - c
2c + 130 = 340 - c
3 c = 340 - 130 ( am dus termenii dupa egal )
3 c = 210
c = 210 : 3
c = 70
b = 70 + 50
b = 120
a = 340 - 120 - 70
a = 220 - 70
a = 150
150 + 120 + 70 = 340
Sper ca te-am ajutat!! (:
