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Stiind ca x+y=-7si y+z=1
a)3x+3y-1=
b)x+2y+z=
c)2x+5y+3z-7=

Răspuns :

a)3x+3y-1=3(x+y)-1=3x(-7)-1=-21-1=-22
b)x+2y+z=x+y+y+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=2x(-7)+3x1=-14+3=-11

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