Запишите в ответе номер верного варианта 1) а^{2}-3а+9=(а-3)во второй степени
2) 9-а^{2}=(3+а)(а-3)
3) (в+1)(а-3)=(1+в)(3-а)
4) (а-1)(2а-3)= 2а^{2}-5а+3
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