Oblicz i zredukuj. X=1/2 Y=pierwiastek z 2 A; 2xy(4-9y)+2x do 2potegi= b) (4+9x)(-2+12x do 2)= c) -(pierwiastek z2 +2x) +3pierwiastek z 3 xy= d) 12x(-2x+6y+7xy)=

[latex]x=frac{1}{2}; y=sqrt2\\a) 2xy(4-9y)+2x^2=8xy-18xy^2+2x^2\\8cdotfrac{1}{2}cdotsqrt2-18cdotfrac{1}{2}cdot(sqrt2)^2+2cdot(frac{1}{2})^2=4sqrt2-18+frac{1}{2}=4sqrt2-17frac{1}{2}\\\b) (4+9x)(-2+12x^2)=-8+48x^2-18x+108x^3\\-8+48cdot(frac{1}{2})^2-18cdotfrac{1}{2}+108cdot(frac{1}{2})^3=-8+12-9+13,5=8,5[/latex] [latex]c) -(sqrt2+2x)+3sqrt3xy=-sqrt2-2x+3sqrt3xy\\-sqrt2-2cdotfrac{1}{2}+3sqrt3cdotfrac{1}{2}cdotsqrt2=-sqrt2-1+frac{3}{2}sqrt6\\\d) 12x(-2x+6y+7xy)=-24x^2+72xy+84x^2y\\-24cdot(frac{1}{2})^2+72cdotfrac{1}{2}cdotsqrt2+84cdot(frac{1}{2})^2cdotsqrt2=-6+36sqrt2+21sqrt2\=57sqrt2-6[/latex]