September 2021 0 7 Report
Докажите тождества: 1. (a - b)(b - c) + (b - a)(b - c) = 0 2. x^2 - 2x -15 = (x - 5)(x + 3) 3. x^2 + x - 6480 = (x - 80)(x + 81) 3. (a + b)^2 - 7(a + b) + 12 = (a + b - 3)(a + b - 4) Буду очень благодарна:)
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