Ответ Проверено экспертом Автор - Evgenia4836 (2a-2b)²/(a-b)= (2(a-b))²/(a-b)= 4(a-b)²/(a-b)= 4(a-b)= 4a-4b(3c+9d)²/(c+3d)= (3(c+3d))²/(c+3d)= 9(c+3d)²/(c+3d)= 9(c+3d)= 9c+27d