[tex][(1,5)^3 -0,375]^2 :8 = \\\\ = [(\frac{\not 15}{\not 10})^3-0,375]^2 :8= \\\\ =[(\frac{3}{2})^3-0,375]^2:8= \\\\ = [(\frac{27}{4})-0,375]^2:8= \\\\ = (6,75-0,375)^2:8= \\\\ = (6,375)^2:8= \\\\ = (\frac{6375}{1000})^2 :8= \\\\ =(\frac{255}{40})^2:8= \\\\ = (\frac{51}{8})^2:8= \\\\ = \frac{2601}{64}*\frac{1}{8} \longrightarrow \boxed{\frac{2601}{512} \to 5,08}}[/tex]
