Question

直接写出得数． 1 5 + 3 5 =	1- 5 9 =	5 4 + 3 4 =	1 3 - 1 7 =	3 11 - 5 11 - 8 11 =
11 21 + 10 21 =	1 4 + 1 2 =	5 6 - 1 6 =	7 12 - 1 6 =	1- 3 8 - 1 8 =

Answer 1

考点：分数的加法和减法

专题：计算题

分析：根据分数加减法的计算法则计算即可．

解答：

解： 1 5 + 3 5 = 4 5	1- 5 9 = 4 9	5 4 + 3 4 =2	1 3 - 1 7 = 4 21	3 11 - 5 11 - 8 11 =- 10 11
11 21 + 10 21 =1	1 4 + 1 2 = 3 4	5 6 - 1 6 = 2 3	7 12 - 1 6 = 5 12	1- 3 8 - 1 8 = 1 2

点评：本题关键是明确分数加减法的计算法则．