Suma de racionales con igual denominador
| __ | 1. | -1/7+4/7-13/7+12/7 | | A. | 0 | | __ | 2. | -3/2+1/2+8/2+11/2-130/2+7/2 | | B. | 7/4 | | __ | 3. | -3/4+10/4+6/4-13/4+1/4-2/4+8/4 | | C. | -8/5 | | __ | 4. | -4/10-10/10+6/10-8/10 | | D. | 4/3 | | __ | 5. | -6/5+4/5-3/5+9/5 | | E. | -53 | | __ | 6. | -12/8+1/8-13/8+6/8-5/8 | | F. | -38/7 | | __ | 7. | 2/3-4/3-12/3+7/3+11/3 | | G. | -7/3 | | __ | 8. | 2/7+5/7-13/7-15/7+1/7-18/7 | | H. | 4/5 | | __ | 9. | 4/6-11/6+5/6-21/6+38/6-15/6 | | I. | -23/8 | | __ | 10. | 4/9-8/9+6/9+10/9-14/9-18/9-1/9 | | J. | 2/7 |
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