Упростите выражения пожалуйста.
5х^2-45
3x^2-75a^2
2a^3-2ay^2
ax^2-4a
(x+3b)(x-3b)-(x+2b)(x^2-2bx+4b^2)
(2x-5)^2-(7x-1)^2
(b+3)(b-3)+(2b+3)^2
3(x-5)^2+(10x-8x^2)
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