№1 Вынесите общий множитель за скобки :
9x^2+3x
2ab-ab^2
6xy+3x^2y-12xy^2
5a^4-10a^3+10a^2
№2 Выполните действия :
(a+b)^2-(a-b)(a+b)
№3 Решите уравнения:
(x-12)(3x+9)=0
x^2-25=0
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