Odpowiedź:
a) [tex]6(x^{2} -x+2)-\frac{1}{2}(12x\neqx^{2}-4x+6)=6x^{2}-6x+12-6x^{2}-2x+3=-8x+15=20+15=35[/tex]
b) [tex]x(3xy+2y)-y(4x^{2} +2x-y)=3x^{2}y+2xy-4x^{2}y-2xy+y^{2}=-1x^{2}+y^{2}=-2,25+100=97,75[/tex]
