Suma por diferencia (Baldor)
| __ | 1. | (1-3ax)(3ax+1) | | A. | x2-y2 | | __ | 2. | (2a-1)(1+2a) | | B. | m2-n2 | | __ | 3. | (2m+9)(2m-9) | | C. | a2-x2 | | __ | 4. | (a-x)(x+a) | | D. | x4-a4 | | __ | 5. | (a3-b2)(a3+b2) | | E. | 4a2-1 | | __ | 6. | (m-n)(m+n) | | F. | n2-1 | | __ | 7. | (n-1)(n+1) | | G. | 1-9a2x2 | | __ | 8. | (x+y)(x-y) | | H. | 4m2-81 | | __ | 9. | (x2+a2)(x2-a2) | | I. | a6-b4 | | __ | 10. | (y2-3y)(y2+3y) | | J. | y4-9y2 |
| __ | 11. | (1-8xy)(8xy+1) | | A. | a2m-b2n | | __ | 12. | (3xa-5ym)(5ym+3xa) | | B. | 1-64x2y2 | | __ | 13. | (6x2-m2x)(6x2+m2x) | | C. | 9x2a-25y2m | | __ | 14. | (am+bn)(am-bn) | | D. | 36x4-m4x2 | | __ | 15. | (ax-2bx-1)(2bx-1+ax) | | E. | a2x-4b2x-2 |
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