6÷ 3/8 – 3/8 ÷6 =1/6x(3/8-3/8)=1/6x0=02. 4/7 × 5/9 + 3/7 × 5/9 =(4/7+3/7)x5/9=1x5/9=5/93. 5/2 -( 3/2 + 4/5 )=5/2-3/2-4/5=1-4/5=1/54. 6 ×( 1/2 + 2/3 )=6x1/2+6x2/3=3+4=75. 8 × 4/5 + 8 × 11/5=8x(4/5+11/5)=8x3=24 6. 31 × 5/6 – 5/6 =(31-1)x5/6=30x5/6=257. 4/5 × 25/16 + 2/3 × 3/4 =5/4+1/2=5/4+2/4=7/48. 101 × 1/5 – 1/5 × 21 =(101-21)x1/5=80x1/5=161. 3/7 × 49/渗埋9 - 4/32. 8/9 × 15/36 + 1/273. 12× 5/6 – 2/9 ×3 4. 8× 5/4 + 1/4 5. 6÷ 3/8 – 3/8 ÷6 6. 4/7 × 5/9 + 3/7 × 5/97. 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 21. 5/7 × 3/25 + 3/7 22. 3/14 ×× 2/搭喊哪3 + 1/6 23. 1/5 × 2/3 + 5/6 24. 9/22 + 1/11 ÷ 1/2 25. 5/3 × 11/5 + 4/3 26. 45 × 2/3 + 1/3 × 15 27. 7/19 + 12/19 × 5/6 28. 1/4 + 3/4 ÷ 2/知码3 29. 8/7 × 21/16 + 1/2 30. 101 × 1/5 – 1/5 × 21 31.58+42= (2)87-45= (3)125×8=
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