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Cel mai inteligent răspuns!
2014-04-30T16:30:54+03:00
A)3(x+y)-1=3*(-7)-1=-21-1=-22;
b)x+2y+z=x+y+y+z=-7+1=-6;
c)2x+5y+3z-7=2x+2y+3y+3z-7=2(x+y)+3(y+z)-7=-14+3+3=-14+6=-8
4 3 4