:) заранее ! 1.х²+у²+2ху-1 2.а²+b²-2ab-25 3.36-b²-c²+2bc - вопрос №925623312122253362 от olgaerchik 04.09.2022 00:17

Question

Алгебра: :) заранее ! 1.х²+у²+2ху-1 2.а²+b²-2ab-25 3.36-b²-c²+2bc

olgaerchik · Answer

1) x^2 + y^2 + 2xy - 1 = (x + y)^2 - 1 = (x + y - 1)(x + y + 1)2) a^2 + b^2 - 2ab - 25 = (a - b)^2 - 25 = (a - b - 5)(a - b + 5)3) 36 - b^2 - c^2 + 2bc = 36 - (b - c)^2 = (6 - b + c)(6 + b - c)...