[tex]5.(-\frac{2}{3})^{3}+4.(-\frac{2}{3})^{2}+6.(-\frac{2}{3})+1\\\\5.(-\frac{8}{27})+4.(\frac{4}{9})-\frac{12}{3}+1\\\\-\frac{40}{27}+\frac{16}{9}-\frac{12}{3}+1\\\\-\frac{40}{27} +\frac{48}{27} -\frac{108}{27} +\frac{27}{27} \\\\-\frac{73}{27}[/tex]
