7/9*8/3=56/27
7/9*3/8=7/24
第一题=7/9×8/3=(7×8)/(9×3)=56/27第二题=(7×3)/(9×8)=7/24
7/9×8/3=27/567/9×3/8=7/24
7/9÷3/8=7/9×8/3=56/277/9×3/8=7/24