Ответы на вопрос:
#1 a^2 - b^2 - a + b = (a - b)(a + b) - 1(a - b) = (a - b) (a + b - 1) #2 x^3 - x^2y - xy^2 + y^3 = x^2 (x - y) - y^2 (x - y) = (x - y)(x^2 - y^2) = = (x - y)(x + y)(x - y)
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