Помогите пожалуйста преобразуйте в многочлен а)(5-а)^2 б)(4х+1)^2 в)(3а-7)(3а+7) упрастите вырадения а)(а-8)(а-7)-(а-9)^2 б)4b(b+1)-(2b-1)^2 в)х(х-5)+(3х+1)^2 г)(2х-5)^2-2(7х-1)^2
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