(-2/3m+3)-( -2/3n+3)
=-2/3m+2/3n
=-2/3(n-m)
∵n/m＞1
∴n＞m
n-m＞0
∴-2/3(n-m)＜0
即：(-2/3m+3)-( -2/3n+3)＜0
∴(-2/3m+3)＜( -2/3n+3)