Question

计算：

6 5 + 5 6 =	2 7 9 + 11 9 =	2 1 12 -1 1 4 =
3 3 8 +11 1 7 =	3 3 8 +11 1 7 =	2 1 3 + 3 2 +1 1 6 =

Answer 1

考点：分数的加法和减法

专题：运算顺序及法则

分析：同分母的分数相加、减，分母不变只把分子相加减即可，异分母分数相加，先通分化成同分母分数，然后按照同分母分数的加法的计算法则进行计算即可．

解答： 解：①

6

5

+

5

6

=

36

30

+

25

30

=

61

30

=2

1

30

②2

7

9

+

11

9

=2+（

7

9

+

11

9

）
=2+2
=4

③2

1

12

-1

1

4

=2

1

12

-1

3

12

=1

13

12

-1

3

12

=

5

6

④3

3

8

+11

1

7

=3

21

56

+11

8

56

=14

29

56

⑤3

3

8

+11

1

7

=3

21

56

+11

8

56

=14

29

56

⑥2

1

3

+

3

2

+1

1

6

=2

2

6

+

9

6

+1

1

6

=3

12

6

=5

点评：本题考查了同分母、异分母分数的计算法则进行计算．