Предмет: Алгебра, автор: 1236548498

Помогите пожалуйста!

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Автор ответа: orakul96

1) (2а+b)(2a-b)=4a^2-b^2
2) 64-y^2=(8-y)(8+y)
3) (x-2)(x+2)-x(x+5)
x^2-4-x^2-5x
-4-5x

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