Question

“口算”对对碰

3

4

+

1

4

=
2+

4

9

=

1

7

+

3

7

+

5

7

=
3-

3

4

=

2

3

+

1

6

=

5

16

-

1

16

-

1

16

=

Answer 1

分析：根据分数加减法的计算方法进行计算．

解答：解：

3

4

+

1

4

=1
2+

4

9

=2

4

9

1

7

+

3

7

+

5

7

=

9

7

3-

3

4

=2

1

4

2

3

+

1

6

=

5

6

5

16

-

1

16

-

1

16

=

3

16

．

点评：口算时，注意运算符号和数据，然后再进一步计算．