Question

直接寫出得數(shù)．

7 8 × 5 14 =	7 13 ×39=	5 6 - 1 2 =	3 10 + 9 10 =	1 3 + 5 7 =
3 4 - 1 8 =	8 9 ÷4=	15÷ 10 13 =	1 3 ÷ 3 4 =	5 8 ÷5=

Answer 1

分析：①②約分計算；③⑤⑥題，通分計算；④只把分子相加，分母不變；⑦⑧⑨⑩題，先把除法改為乘法，再計算．

解答：解：

7

8

×

5

14

=

5

16

；      

7

13

×39=21；        

5

6

-

1

2

=

1

3

；       

3

10

+

9

10

=

6

5

；       

1

3

+

5

7

=

22

21

；

3

4

-

1

8

=

5

8

；             

8

9

÷4=

2

9

；            15÷

10

13

=

39

2

；     

1

3

÷

3

4

=

4

9

；         

5

8

÷5=

1

8

．

點(diǎn)評：此題考查了分?jǐn)?shù)的加、減、乘、除運(yùn)算，掌握運(yùn)算方法，是解答的關(guān)鍵．