3/7 × 49/9 - 4/3 =1
2. 8/9 × 15/36 + 1/27=11/27
3. 12× 5/6 – 2/9 ×3 =28/3
4. 8× 5/4 + 1/4 =41/4
5. 6÷ 3/8 –虚差镇 3/8 ÷6 =255/16
6. 4/7 × 5/9 + 3/7 × 5/9 =5/9
7. 5/2 -( 3/2 + 4/5 )=1/5
8. 7/8 + ( 1/8 + 1/9 )=10/9
9. 9 × 5/6 + 5/6=25/3
10. 3/4 × 8/9 - 1/3 =1/3
11. 30.8÷[14-(9.85+1.07)]=10
12. [60-(9.5+28.9)]÷0.18 =120
13. 2.881÷0.43-0.24×3.5 =5.86
14. 20×[(2.44-1.8)÷0.4+0.15]=35
15. 28-(3.4+1.25×2.4)=21.6
16. 2.55×7.1+2.45×7.1=35.5
17. 777×9+1111×3=10326
18. 庆镇0.8×〔差粗15.5-(3.21+5.79)〕=5.272
19. (31.8+3.2×4)÷5 =8.92
20. 31.5×4÷(6+3)=14