30道分数加减混合运算及答案？您好，1. 5/6 + 1/3 = 11/62. 2/5 - 1/4 = 3/203. 3/8 + 1/2 = 7/84. 5/6 - 1/2 = 1/35. 1/4 + 2/3 = 11/...