18个65的和是 ,570的40倍是 .
=24÷ = %=二成= 折.
%=0.25= ÷16= :32.
÷ =0.6= :15= %= 折.
= ÷8=0.125= %=5: .
6:10=12: == ÷40= (填小数)= %