упростите выражение
2y (11y - 9) + 0.5 (4y - 3) (4y + 3)
(a - 3b) (a + 3b) + (2a - 3b)^2 - 4a (b - a)
(x + 6y)^2 - (6y + 5x) (6y - 5x) + x (12y - 6x)
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