x+y+z=9000
x+y=5000
5000+z=9000
z=9000-5000
z=4000
x+y+z=9000
y+z=7000
x+7000=9000
x=9000-7000
x=2000
x+y=5000
2000+y=5000
y=5000-2000
y=3000
Răspuns:
x=2000; y=3000; z=4000
Explicație pas cu pas:
x+7000=9000
x=9000-7000
x=2000
x+y=5000
2000+y=5000
y=5000-2000
y=3000
y+z=7000
3000+z=7000
z=7000-3000
z=4000
