3n/2m•(p/3n)²÷p²/mn

3n/2m•(p/3n)²÷p²/mn
3n/2m•(p/3n)²÷p²/mn

3n/2m•(p/3n)²÷p²/mn
3n/2m•(p/3n)²÷p²/mn
=3n/2m•p²/9n²÷p²/mn
=p²/6mn ÷p²/mn
=1/6
如果本题有什么不明白可以追问,

3n/2m•(p/3n)²÷p²/mn3n/2m•(p/3n)²÷p²/mn

约分之后的