November 2021 0 6 Report
Помогите пож, буду очень благодарна. Докажите тождетство.
а) х^2+х-6480=(х-80)(х+81)
б)(а+b)^2-7(a+b)+12=(a+b-3)(a+b-4)
в)a(b-c+d)= -a(c-b-d)
г) (a-b)(c-d)=(b-a)(d-c)
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