Y 9x 2 12x 4 July 8, 2019 16 32 64 128 Y 2x 3 9x 2 12x 4 Cho hàm số y 2x 3 9x 2 12x 4 9x ^ 4 - 12x ^ 2 * y + 4y ^ 2 = 4x ^ 4 - 12x ^ 2 * y + 9y ^ 2 =
