Вправа 3.
а) 3х(х – 6) + (2х 2 + 14) =
б) (а – 3)с + 3(с – с 2 ) =
в) (3а + b)(а – b) – (2а 2 – b 2 ) =
г) (а – 3)(а + 3) – 9а 2 =
 Вправа 4.
а) (а + b) 2 =
б) (x – y) 2 =
в) (2а – x) 2 =
г) (3а + 2) 2 =
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