五年级下册简单数学题及答案

2.7/8 + ( 1/8 + 1/9 )

3.5/6 + ( 1/2 + 2/3 )

4.9/7 - ( 2/7 - 10/21 )

5.3/7 + 49/9 + 4/7

6.8/9 + 15/36 + 3/27

7.5/2 - ( 3/2 + 4/5 )

8.7/8 + ( 1/8 + 1/9 )

9.9/7 - ( 2/7 - 10/21 )

10.1/5 + ( 3/7 + 8/10 )