Преобразуйте в многочлен
1)2х(х-3)-3х(х+5)
2)(а-7)(а-1)+(а-3)
3)3(у+5)^2-3y^2
4)(x-3)(x-7)-2x(3x-5)
5)4a(a-2)-(a-4)^2
6)2(m+1)^2-4m ПОМАГИТЕ ПОЖ
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