а) [m]b^{1/3}*b^{-1/4} = b^{1/3-1/4} = b^{4/12-3/12} = b^{1/12}[/m]
б) [m]\frac{y^{2/3}*y^{-1}}{y^{1/3}} = \frac{y^{2/3-1}}{y^{1/3}} = \frac{y^{-1/3}}{y^{1/3}} = \frac{y^{-1/3-1/3}}{1} = y^{-2/3}[/m]
в) [m](a^{3/4})^4*a^{-3/2} = a^3*a^{-3/2} = a^{3-3/2} = a^{3/2}[/m]
г) [m](27n^{-3})^{-1/3} = (\frac{3^3}{n^3})^{-1/3} = (\frac{3}{n})^{-1} = n/3[/m]
д) [m]\frac{a^{3,2}a^{-2,8}}{a^{-2,6}a^{-2}} = \frac{a^{3,2-2,8}}{a^{-2,6-2}} = \frac{a^{0,4}}{a^{-4,6}} = a^{0,4}a^{4,6} = a^{0,4+4,6} = a^5[/m]