Bài toán 1: Tính 1. (x+2y)2 11. (x2−2y)2 2. (2x+3y)2 12. (2x−y)2 3. (3x−2y)2 13. (32x+3y)2 4. (5x−y)2 14. (2x+8y)2 5. (x+14)2 15. (x+16y+3)2 6. (2x−12)2 16. (12x−4y)2 7. (13x−12y)2 17. (x2+2y2)(x2−2y2) 8. (3x+1)(3x−1) 18. (x2−4)(x2+4) 9. (x2+25y)(x2−25y) 19. (x+y)2+(x−y)2 10. (x2−y)(x2+y) 20.
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