X 4 4x 2 1 0
- X 4 4x 3 4x 2 1 0
- X 4 4x 3 12x 2 x 1 0
- X 4 4x 3 3x 2 2x 1 0
- X 2 4x 4 2x 2 x 1 0
- X 4 x 2 1 x 2 4x 5 0
- X 5 4x 4 3x 3 3x 2 4x 1 0
- X 4 4x 3 2x 2 1 0
- X 4 4x 3 6x 2 4x 1 0
- X 4 3x 3 4x 2 3x 1 0
- X 5 4x 4 x 3 x 2 4x 1 0
- Tìm x biết x 4 4x 3 6x 2 4x 1 0
- X 4 4x 3 ax 2 bx 1 0
- X 4 3x 2 4x 2 3x 1 0
- 4x 8 4 2x x 2 1 0