\[\boxed{\text{592\ (592).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ (a + b)^{2} = a^{2} + b^{2}\]
\[a^{2} + 2ab + b^{2} = a^{2} + b^{2}\]
\[2ab = 0.\]
\[\Longrightarrow верно\ при\ a = b = 0;\]
\[2)\ (a - b)^{2} = (a + b)^{2}\]
\[a^{2} - 2ab + b^{2} = a^{2} + 2ab + b^{2}\]
\[- 2ab = 2ab\]
\[- 4ab = 0\]
\[\Longrightarrow верно\ при\ a = b = 0.\ \]