Usuń nawiasy i zredukuj wyrazy podobne. a.-2(3a+5b)+3(4b-6a) b.-7(x-3y+1/7z-2)-3(y+x+z)-18y c.2(1/2a+0,25b)-4(1,25a-3/4b)-a+b d.-1/3(2,1x dop2-41/5y dop2)+ydop2+5xdop2+6(2/3ydop2-1i1/3xdop2)

a)  -6a-10b+12b-18a = -24a+2b  b)-7x + 21y -z+14-3y-3x-3z-18y= -10x -4z+14 c) a +0.5b -5a +3b -a+b=  -5a + 4.5 b 

a)[latex]-2(3a+b)+3(4b-6a)-2(3a+5b)+3(4b-6a)=-6a-10b+12b-18a=2b-24a[/latex]   b)[latex]-7(x-3y+frac{1}{7}z-2)-3(y+x+z)-18y=-7(x-3y+frac{1}{7}z-2)-3(y+x+z)-18y=\=-7x+21y-z+14-3y-3x-3z-18y=\=14-10x-4z[/latex]   c)[latex]2(frac{1}{2}a+0,25b)-4(1,25a-frac{3}{4}b)-a+b=a+0,5b-5a+3b-a+b=\=4,5b-5a[/latex]   d)[latex]-frac{1}{3}(2,1x^{2}-frac{41}{5}y^{2})+y^{2}+5x^{2}+6(frac{2}{3}y^{2}-1frac{1}{3}x^{2})=\ =-0,7x^{2}+frac{41}{8}y^{2}+y^{2}+5x^{2}+4y^{2}-8x^{2}=\ =10,125y^{2}-3,7x^{2}[/latex]