1. ( * + 2в) 2 = а 2 + * ав +* в 2
2. (3а - * ) 2 = * а 2 - 6ах + *
3. (3х + *) 2 = * + * + 49у 2
4. (* - 2а) 2 = * - 12ав + *
5. * - 25 =( а – * )( а + *)
6. (2в – а )( * + а )= * - а 2
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