能简算的要简算8/9×(5/9-1/4)×8/11 =8/9×(11/36×8/11)=8/9×2/9=16/814/9×(3/10-5/6×3/10) =4/9×(3/10-1/4)=4/9×1/20=1/453/8×(3/5-1/3×3/10)=3/8×(3/5-1/10)=3/8×1/2=3/16
应该是522