НЕ ПРОХОДИТЕ МИМО. ДАЮ 20 БАЛЛОВ!!!! РЕШИТЕ
1.Сократите дробь: 3abc^8 / a^3bc^2

2.Докажите тождество: 2ab-(a+b)^2+2a^2=(a-b)(a+b)

3.решите уравнение: x^3+3x^2-9x-27=0
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