Zad. 4.8 a) 2+2+2=8 b) -3*4-1-1=-14 c) 1+2-0,5-0,75=1,75 d) [latex]frac{-frac{1}{2}+0,6}{-frac{3}{4}}=[/latex] [latex]frac{-frac{5}{10}+frac{6}{10}}{-frac{3}{4}}=[/latex] [latex]frac{1}{10}*-frac{4}{3}=frac{4}{30}=-frac{2}{15}[/latex] Zad. 4.9 [latex]a=frac{20-8,6}{4}=frac{11,4}{4}=2frac{34}{40}=2 frac{17}{20}=2,85[/latex] Zad. 4.25 a) a+2a-3a-4a=-4a b) (3a-2b)+(4b-2a)=3a-2b+4b-2a=a+2b c) 4b-(-2b)=4b+2b=6b d) 4a-(2b+3a)+b=4a-2b-3a+b=a-b Zad.4.27 2y-3(2y-x)+2(3x-y)-4x=2y-6y+3x+6x-2y-4x=5x-6y [latex]-10-6*-frac{1}{6}=-10+1=-9[/latex] Zad.4.28 a) (4x+5)+(5x-7)=4x+5+5x-7=9x-2 b) 2x-6-(-2x+4)=2x-6+2x-4=4x-10 c) [latex]frac{1}{2}x+2-(-frac{3}{4}x-8)=frac{2}{4}x+2+frac{3}{4}x+8=frac{5}{4}x+10=1frac{1}{4}x+10[/latex] d) 3-3(2x+4)-(x-5)=3-6x-12-x+5=-7x-4 e) [latex]a-(frac{2}{5}a+frac{1}{3}b)+frac{1}{3}b=a-frac{2}{5}a-frac{1}{3}b+frac{1}{3}b=a-frac{2}{5}a=frac{3}{5}a[/latex] f) -(2,4y+6)-(3,6y+5)-(2y+8)=-2,4y-6-3,6y-5-2y-8=-8y-19 Zad. 4.32 a) 4(2x-1)-(x-1)(x+2)=8x-4-x^2-2x+x+2=-x^2+7x-2 b) -3(x+3)+(1-x)(x+3)=-3x-9+x+3-x^2-3x=-x^2-5x-6 c) 2x-2x(4-x)+2x^2=2x-8x+2x^2+2x^2=4x^2-6x d) (x-1)(x-2)(x-3)=(x^2-2x-x+2)(x-3)=x^3-3x^2-2x^2+6x-x^2+3x+2x-6=x^3-6x^2+11x-6
