1) Упростите выражения: а) (х-3)(х-7)-2х(3х+5)=
б) 4а(а-2)-(а-4)=
в) 2(m+1)²-4m=
2) Разложите на множители:
а) x³-9x=
б) -5a²-10ab-5b²=
3) Упростите выражения:
(y²-2y)²-y²(y+3)(y-3)+2y(2y²+5)=
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