ZADNIE I Opusc nawias i zredukuj wyrazy podobne. a) 2(x-2y) - 3x(1-4y) - 1,5y(8-4x) b) 10a^2b + (2 1/2a^2b+1/2ab^2) - (7,5a^2b - ab^2) ZADANIE II Przekształć wyrazenie (a-2b)(2a+3b) - 2a(a-6b) - 5ab do najprostrzej postaci a nastepnie oblicz wa

1.a) 2(x-2y)-3x(1-4y)-1,5y(8-4x)=2x-4y-3x+12xy-12y+6xy=-x-16y+18xy b)10a²b+(2 1/2a²b+1/2ab²)-(7,5a²b-ab²)=10a²b+2 1/2a²b+ 1/2ab²-7,5a²b+ab²=5a²1 1/2ab² 2. a=-I-1,5I=-1,5 b=(√1/4) do -1=(1/2)do-1=2 (a-2b)(2a+3b)-2a(a-6b)-5ab=2a²+3ab-2ab-6b²-4a²+12ab-5ab=-2a²-6b²+8ab -2*(1,5)²-6*(2)²+8*(-1,5)*2=-4,5-24-24=-52,5

zad 1 [latex]a) 2(x-2y) - 3x(1-4y) - 1,5y(8-4x)=\ \ =2x-4y-3x+12xy-12y+6xy=\ \ =-x+18xy-16y\ \ \ b) 10a^{2}b + (2frac{1}{2}a^{2}b+frac{1}{2}ab^{2}) - (7,5a^{2}b - ab^{2})=\ \ =10a^{2}b+2,5a^{2}b+0,5ab^{2}-7,5a^{2}b+ab^{2}=\ \ =5a^{2}b+1,5ab^{2}[/latex] zad 2 [latex](a-2b)(2a+3b)-2a(a-6b)-5ab=\ \ =2a^{2}+3ab-4ab-6b^{2}-2a^{2}+12ab-5ab=\ \ =6ab-6b^{2}=\ \ a=-|-1,5|=-1,5\ b=sqrt{frac{1}{4}}^{-1}=(frac{1}{2})^{-1}=2\ \ =6*(-1,5)*2-6*2^{2}=-18-6*4=-18-24=-42[/latex]