Tính: c) [ ( − 2/3 ) + 3/4 ]^2 . 12/5 − 1/5

c) ${[\left(\frac{-2}{3}\right)+\frac{3}{4}]}^2.\frac{12}{5}-\frac{1}{5}$

$={[\left(\frac{-8}{12}\right)+\frac{9}{12}]}^2.\frac{12}{5}-\frac{1}{5}$

$={\left(\frac{1}{12}\right)}^2.\frac{12}{5}-\frac{1}{5}$

$=\frac{1}{{12}^2}.\frac{12}{5}-\frac{1}{5}$

$=\frac{1}{60}-\frac{1}{5}=\frac{-11}{60}$