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Автор - varavara061200

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9(m+n)^2-(m-n)^2

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Проверено экспертом

Автор - Freakazoid
9(m+n)^{2}-(m-n)^{2}\a^{2}-b^{2}=(a-b)(a+b)\(3(m+n))^{2}-(m-n)^{2}=(3(m+n)-(m-n))(3(m+n)+(m-n))\=(3m+3n-m+n)(3m+3n+m-n)=(4n+2m)(4m-2n)

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