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Ответ дан
nklbelousov

2y^2. Смотри на фотке. Вот и все.

Ответ

Ответ дан
Ardnaskelo245

(7x-2)(2x+7y)-(49x^2-6y^2)=(49x^2-4y^2)-(49x^2-6y^2)=49x^2-4y^2-49x^2+6y^2=-4y^2+6y^2=2y^2

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