Предмет: Алгебра, автор: anya1288

(x-3y)(x+3y)
решите пожалуйста

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Автор ответа: tatianahumanity
0
(x-3y)(x+3y)=x²+3xy-3xy-9y²=x²-9y²=x²-(3y)²


Разность квадратов двух чисел равна произведению разности этих чисел на их сумму
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