\(\left(\frac{2}{5}-\frac{1}{2}\right)^2+\left(\frac{1}{2}+\frac{3}{5}\right)^2\)
\(\Leftrightarrow\left(\frac{2}{5}\right)^2+\left(\left(\frac{-1}{2}\right)^2+\left(\frac{1}{2}\right)^2\right)+\left(\frac{3}{5}\right)^2\)
\(\Leftrightarrow\left(\frac{2}{5}\right)^2+\left(\frac{3}{5}\right)^2\)
\(\Leftrightarrow\left(\frac{2}{5}+\frac{3}{5}\right)^2\)
\(=1\)
(25−12)2+(12+35)2(25−12)2+(12+35)2
(25)2+((−12)2+(12)2)+(35)2
(25)2+(35)2
(25+35)2
=1