(-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)