计算。⑴7元3角-5元=( )元( )角⑵4元2角+5角=( )元( )角⑶3元6角+3角=( )元( )角⑷6元9角-6角=( )元( )角⑸4元3角+7角=( )元⑹9角+9元1角=( )元
:12== ÷20= 用小数表示.
0.75= :8=15÷ =9: = %= 折.
:2= :5= %=24÷ .
0.375= ÷ = :16== %
27: =0.75== %