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Автор - ksenia200668

(15а+2b)²-(3a-7b)(3b-5a)

Ответ

Автор - WOreLS

225a^(2)+60ab+4b^(2)-(9ab-15a^(2)+35ab)

225a^(2)+60ab+4b^(2)-(44ab-15a^(2)-21b^(2)

225a^(2)+60ab+4b^(2)-44ab+15a^(2)+21b^(2)

240a^(2)+16ab+25b^(2)

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