(111+1/9)×9=111×9+1/9×9=999+1=1000 1/3×4/9+5/9÷3=1/3×4/9+5/9×1/3=1/3×(4/9+5/9)=1/3×1=1/3 (7/5-1/3)÷(1/3+1/5)=(7/5-1/3)×15/8=7/5×15/8-1/3×15/8=21/8-5/8=2 (9/16÷9+9/16×1/9)÷5/8=(9/16×1/9+9/16×1/9)÷5/8=9/16×1/9×2×8/5=1/5