a]
[tex]6x^3yz=6\cdot(\frac{1}{2})^3\cdot(-\frac{3}{4})\cdot(-\frac{2}{3})=\\\\=6\cdot\frac{1}{8}\cdot\frac{1}{2}=\frac{6}{16}=\frac{3}{8}[/tex]
b]
[tex]pr^2s=-2\frac{1}{3}\cdot(1\frac{1}{2})^2\cdot(-3,2)=\\\\=-\frac{7}{3}\cdot(\frac{3}{2})^2\cdot(-3,2)=-\frac{7}{3}\cdot\frac{9}{4}\cdot(-3,2)=\\\\=-5,25\cdot(-3,2)=16,8[/tex]
c]
[tex]2x^4yz^5=2\cdot(-2)^4\cdot(-\frac{1}{8})\cdot(-1)^5=\\\\=2\cdot16\cdot(-\frac{1}{8})\cdot(-1)=32\cdot\frac{1}{8}=4[/tex]
