(8/9)/x=2/3x=(8/9)/(2/3)x=(8/9)*(3/2)x=4/3
先去分母，得18X=24，所以X=4|3
8/9÷x=2/3x=2/3×8/9x=16/27
9/(8X)=2/38X=9/(2/3)8X=27/2X=27/16
