Corretto: (a + b)(a - b), (a + b) 2, (2a - b) 2, (3a + 2b)(2b - 3a), (a - 2b) 2 = a2 - 4ab + 4b2, Errato: (a + b)(a - 2b), a 2 +b, 4a 2 - b, (3a + 2b)(2a - 3b), (a - 2b) 2 = a2 + 2ab + 4b2,

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