(1-[latex] \frac{2}{5} [/latex] ) × (2-1[latex] \frac{1}{2} [/latex] )² =

1- [latex] \frac{2}{5} [/latex]= [latex] \frac{3}{5} [/latex] 2-1[latex] \frac{1}{2} [/latex]=[latex] \frac{1}{2} [/latex] [latex] \frac{1}{2} [/latex][latex]^{2} [/latex]=[latex] \frac{1}{4} [/latex] [latex] \frac{3}{5} [/latex]×[latex] \frac{1}{4} [/latex]=[latex] \frac{3}{20} [/latex]