[2右3分之1+(5.4-2右3分之2)*1右3分之2]/6右9分之8=[2+1/3+(5.4-2-2/3)*5/3]/(62/9)=[2+1/3+(3.4-2/3)*5/3]/(62/9)=[2+1/3+(17/5-2/3)*5/3]/(62/9)=[2+1/3+17/5*5/3-2/3*5/3]/(62/9)=[2+1/3+17/3-10/9]/(62/9)=[2+6-...