\[\boxed{\text{682\ (682).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ (x + 10)^{2} =\]
\[= (x + 10)(x + 10) =\]
\[= x^{2} + 20x + 100\]
\[\textbf{б)}\ (1 - y)^{2} = (1 - y)(1 - y) =\]
\[\textbf{в)}\ (3a - 1)^{2} =\]
\[= (3a - 1)(3a - 1) =\]
\[= 9a^{2} - 6a + 1\]
\[\textbf{г)}\ (5 - 6b)^{2} =\]
\[= (5 - 6b)(5 - 6b) =\]
\[= 36b^{2} - 60b + 25\ \]