五年级分数四则运算:1000！谢谢你

2.3/14 ×× 2/3 + 1/6

3.1/5 × 2/3 + 5/6

4.9/22 + 1/11 ÷ 1/2

5.5/3 × 11/5 + 4/3

6.4/7 × 5/9 + 3/7 × 5/9

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

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

9.9 × 5/6 + 5/6

10.3/4 × 8/9 - 1/3

11.7 × 5/49 + 3/14

12.6 ×( 1/2 + 2/3 )

13.8 × 4/5 + 8 × 11/5

14.31 × 5/6 – 5/6

15.9/7 - ( 2/7 – 10/21 )

16.5/9 × 18 – 14 × 2/7

17.4/5 × 25/16 + 2/3 × 3/4

18.14 × 8/7 – 5/6 × 12/15

19.17/32 – 3/4 × 9/24

20.3 × 2/9 + 1/3