Răspunsuri

  • Utilizator Brainly
2014-05-15T17:31:56+03:00
X+y+z=4200
x+y=2800
y+z=2500

2800+z=4200
z=4200-2800
z=1400

x+2500=4200
x=4200-2500
x=1700

1700+y=2800
y=2800-1700
y=1100

Verificare : 1700+1100+1400=4200
2014-05-15T17:33:08+03:00
2800+z=4200=> z=4200-2800=1400 z=1400
y+1400=4200=>y=4200-1400=2800   y=2800
x+2800=2800=>x=0                                 x=0
Verificare
x+y+z=4200
1400+2800+0=4200,Corect !