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2014-02-10T19:07:02+02:00
X+y=130
x+z=100
y+z=70
Adunam cele trei relatii si obtinem>
2(x+y+z)=300
x+y+z+150 si pentru ca y+z=70, avem
x+70=150
x=80
80+y=130⇒y=50
1 5 1
2014-02-10T19:12:43+02:00
X+y=130
x+z=100
z=70 => x=100-70 => x=30
x+y=130 => 30+y=130 => y=130-30 => y=100