Bài tập toán
----- Nội dung ảnh -----
1. \( a^2 - b^2 - 12a + 12b \)
2. \( 2c^4y^2 + x^2y + \frac{1}{4}y^3 \)
3. \( 2c^2 - 25y^4 - 6x + 9 \)
4. \( 4x^2 - 25y^2 + 4xc + 1 \)
5. \( 8x^3 + 27y^3 \)
6. \( 15x^3 + \frac{1}{27} \)
7. \( 11, x^2 - 2x - 3 \)
8. \( 17, x^2 - 4x - 5 \)
9. \( 18, 6x^2 + 6y^2 - 24 + 12xy \)
10. \( 19, x^3 - 4 - 25xy^2 + 4xc \)
11. \( 20, x^2 - y^2 + y^4xc + e_{10} \)