2/9-23/32*2/9
=(2/9)×(1-23/32)
=(2/9)×(9/32)
=1/16;
8/9÷5/6*3/16
=(8/9)×(6/5)×(3/16)
=1/5;
3÷（5/7-3/14）
=3÷(10/14-3/14)
=3÷(7/14)
=3×2
=6;
如果本题有什么不明白可以追问,