1.
упростите выражение:
а) (х-3)(х+3) + (х+3)^2
б) (у-4)^2 - (4-у)(4+у)
2.
решите уравнение:
а) (2х + 3)^2 - 7x = (2x - 1)(2x+1)
б) (у+1)^3 - y(y^2 + 3y) = 7
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