2a(x-2y)(x^2+2xy+4y^2)
у² - 10у + 25 - 3ху + 15х =
= (у² - 10у + 25) - (3ху - 15х) =
= (у - 5)² - 3х*(у - 5) =
= (у - 5)(у - 5 - 3х)
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2a(x-2y)(x^2+2xy+4y^2)
у² - 10у + 25 - 3ху + 15х =
= (у² - 10у + 25) - (3ху - 15х) =
= (у - 5)² - 3х*(у - 5) =
= (у - 5)(у - 5 - 3х)