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简便简便:1. 5/2 -(3/2 + 4/5 ):1. 5/2 -(3/2 + 4/5 )2. 7/8 + (1/8 + 1/9 )3. 5/6 + (1/2 + 2/3 )4. 9/7 - (2/7 - 10/21 )5. 3/7 + 49/9 + 4/76. 8/9 + 15/36 + 3/277. 5/2 - (3/2 + 4/5 )8. 7/8 + (1/8 + 1/9 )9. 9/7 - (2/7 - 10/21 )10. 1/5 + (3/7 + 8/10 )分数脱式:1. 1/3 + 3/4 + 1/52. 3/8 + 8/3 - 1/23. 5/6 + 1/12 + 3/44. 30/46 - 1/2 + 7/235. 8/11 + 2/6 + 7/336. 19/8 - 1/2 - 3/47. 7/25 + 3/10 - 2/58. 18/121 - 1/2 + 9/119. 6/17 - 1/51 - 1/3410.8/15 + 7/3 - 8/5