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Calculati: 3(x-y)-(2x+y)+ (y-x), x,y apartine R
P.S. DAU COROANA


Răspuns :

3x + 3y - 2x - y + y - x = 3x - 3x + 3y =  - 3y

-3y ∈ R
3(x-y)-(2x+y)+(y-x)=3x-3y-2x-y+y-x=x-3y-y+y-x=-3y