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2014-11-15T15:15:09+02:00
2x+7y+5z  pe 7yil descompunem in 5+2, adica
2x+2y+5y+5z=
2(x+y)+5(y+z)=
2*30+5*15=
60+75=
135
1 5 1
2014-11-15T15:15:53+02:00
X+y=30 I x2
y+z=15 I x5
2x+2y+5y+5z=60+75
2x+7y+5z=135