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Descompuneti in factori ( 2x+3y+4z) la patrat - (4x-5y+7z) la patrat

Răspuns :

( 2x+3y+4z)² - (4x-5y+7z)²=

(2x + 3y + 4z + 4x - 5y + 7z)(2x + 3y + 4z- 4x + 5y - 7z) =

( 6x - 2y + 11z)(8y - 2x - 3z)

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