A) [tex](1\frac{1}{5}-\frac{2}{3} )^2=(1\frac{3}{15}-\frac{10}{15} )^{2} =(\frac{18}{15} -\frac{10}{15} )^2=(\frac{8}{15})^2=\frac{64}{225}[/tex]
B) [tex]-3\cdot9^2=-3\cdot81=-243\\\\-3\cdot4^2=-3\cdot16=-48[/tex]
C) [tex]\frac{-3^2}{\sqrt{16-7} }=\frac{-9}{\sqrt{9} }=-9:3=-3[/tex]
