Cześć ;-)
a)
[tex]6(x+y+2)-3y+3(2x-y)-12x=\\\\=6x+6y+12-3y+6x-3y-12x=\\\\=6x+6x-12x+6y-3y-3y+12=\boxed{12}\\\\\text{C.N.D.}[/tex]
b)
[tex]-3(9x^2y^2-3xy^2-2)+4,5xy^2(6x-2)=\\\\=-27x^2y^2+9xy^2+6+27x^2y^2-9xy^2=\\\\=-27x^2y^2+27x^2y^2+9xy^2-9xy^2+6=\boxed6\\\\\text{C.N.D.}[/tex]
Pozdrawiam!
