Răspunsuri

2014-05-07T00:22:25+03:00
Ex.3
x_Maria
y-mama
{x+y=86        inmultim cu-2⇒{-2x-2y=-172
{2x+3y=220                          {2x+3y=220
-2y+3y=220-172
y=48 coltunasi mama
x=86-48
x=38 coltunasi maria
ex.7)   a+(a+1)+(a+2)=33
3a+3=33
3a=33-3
a=30/3
a=10
nr.sunt 10, 11,  12