Question

3 5 + 3 4 =	1- 7 12 =	1 5 + 1 7 =
1 9 - 1 10 =	1 6 + 1 7 =	5 6 + 1 12 =
1 2 - 1 3 =	7 8 - 3 4 =	8 15 + 7 20 =

Answer 1

分析：根据分数加减法的计算方法：异分母分数相加减，要先通分，然后再按照同分母分数相加减的计算方法进行计算即可得到答案．

解答：解：

3 5 + 3 4 =1 7 20	1- 7 12 = 5 12	1 5 + 1 7 = 12 35
1 9 - 1 10 = 1 90	1 6 + 1 7 = 13 42	5 6 + 1 12 = 11 12
1 2 - 1 3 = 1 6	7 8 - 3 4 = 1 8	8 15 + 7 20 = 53 60

点评：此题主要考查的是分数加减法计算方法的应用．