①30.6÷(204÷10)
=30.6÷20.4,
=1.5.
答:除数是1.5.
②(24-2)×1.6+5.5
=22×1.6+5.5,
=35.2+5.5,
=40.7(元).
答:他一共需要花40.7元钱.