Question

直接寫出得數(shù) 3 8 - 1 8 =	3 6 + 3 6 =	2 5 + 1 5 =
3 10 + 1 10 =	1- 5 7 =	8 9 - 2 9 =

Answer 1

考點：分?jǐn)?shù)的加法和減法

專題：運算順序及法則

分析：同分母分?jǐn)?shù)相加減的計算法則：分母不變，只把分子相加減，據(jù)此直接計算即可解答問題．

解答： 解：

3

8

-

1

8

=

3-1

8

=

2

8

=

1

4

3

6

+

3

6

=

6

6

=1

2

5

+

1

5

=

2+1

5

=

3

5

3

10

+

1

10

=

3+1

10

=

4

10

=

2

5

1-

5

7

=

7-5

7

=

2

7

8

9

-

2

9

=

8-2

9

=

6

9

=

2

3

．

點評：此題主要考查同分母分?jǐn)?shù)的加減法的計算應(yīng)用，要注意計算結(jié)果是最簡分?jǐn)?shù)．