65.4-（34又五分之二+5.25）-14又四分之三
=65+2/5-(34+2/5+5+1/4)-14-3/4
=51+2/5-(39+2/5+1/4)-3/4
=51+2/5-39-2/5-1/4-3/4
=12+2/5-2/5-(1/4+3/4)
=12-1
=11