X 4 4x 3 9x 2 20x 22 July 8, 2019 16 32 64 128 Tìm gtnn x 4 4x 3 9x 2 20x 22 (x + 3)/(4x ^ 2 - 9) - (3 - x)/(4x ^ 2 + 12x + 9) = 2/(2x - 3)
