3x 2 12x k 3 0 July 8, 2019 16 32 64 128 Ii 3x 2 )+ 12x k 3 0 2x 3 3x 2 12x k 0 3x 3 x 2 12x 4 0 X 3 3x 2 12x 10 0 X 4 4x 3 3x 2 12x 0 方程式 2x 3 3x 2 12x k 0
