Обозначение символа альфа - @ ([email protected][email protected])^2 - ([email protected]@)^2
([email protected] + [email protected])² - ([email protected] - [email protected])² = ([email protected] + [email protected] - [email protected] + [email protected])([email protected] + [email protected] + [email protected] - [email protected]) = [email protected]@ = 4 Ответ: 4