Question

在（　　）里填上合適的數．

3

7

+

(  )

7

=

5

7

(  )

9

-

4

9

=0

5

6

-

(  )

(  )

=

1

6

1

5

+

1

(  )

=

2

5

3

8

+

(  )

8

=1
1-

( )

10

=

3

10

．

Answer 1

分析：根據分數加減法的計算方法進行計算．

解答：解：

3

7

+

2

7

=

5

7

4

9

-

4

9

=0

5

6

-

4

6

=

1

6

1

5

+

1

5

=

2

5

3

8

+

5

8

=1
1-

7

10

=

3

10

點評：考查了同分母分數加減法，分母不變，只把分子相加減．