упростите выражение:

а) (x-3) • (x-7) - 2x • (3x-5)
б) 4a • (a-2) - (a-4)^2
в) 2 • (m+1)^2 - 4m

Разложите на множители:
а) x^3 - 9x
б) -5a^2 -10ab - 5b^2

Упростите выражение :
(y^2 - 2y)^2 - y^2 • (y +3)•(y-3)+2y•(2y^2+5)
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