wykonaj mnożenie i zredaguj wyrazy podobne: (x-1)(y+2)+2xy= (1-b)(b-4)+4b= x(x+1)+x+x do potęgi 2= (x+2y)+3(x-4y)=

[latex](x-1)(y+2)+2xy=xy+2x-y-2+2xy=3xy+2x-y-2\ (1-b)(b-4)+4b=b-4-b^2+4b+4b9b-4-b^2\ [/latex] [latex]x(x+1)+x+x ^2=x^2+x+x+x^2=2x^2+2x\ (x+2y)+3(x-4y)=x+2y+3x-12y=4x-10y[/latex]