\[\boxed{\text{601\ (}\text{н}\text{).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[рис.\ 7:(a + b)(a + b) =\]
\[= a^{2} + \text{ab} + \text{ba} + b^{2} =\]
\[= a² + 2\text{ab} + b² = (a + b)^{2};\]
\[рис.\ 8:(a - b)(a - b) =\]
\[= a^{2} - ab - ba + b^{2} =\]
\[= a^{2} - 2ab + b^{2} = (a - b)²\]
\[\boxed{\text{601\ (}\text{c}\text{).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[рис.\ 5:(a + b)(a + b) =\]
\[= a^{2} + \text{ab} + \text{ba} + b^{2} =\]
\[= a² + 2\text{ab} + b² = (a + b)^{2};\]
\[рис.\ 6:(a - b)(a - b) =\]
\[= a^{2} - ab - ba + b^{2} =\]
\[= a^{2} - 2ab + b^{2} = (a - b)²\]