В каком случае преобразование выполнено верно? 1) (4 - b)(b + 4) = b2 -16 3) (b +1)(3 - 2b) = 3 + b - 2b2
2) -(b -1)(3- 4b) = (1- b)(4b - 3) 4) (b - 4)2 = b2 - 4b +16
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