1÷A=B,(A≠0),那么A与B互为倒数. .
2=2=40÷( )==9÷( )
=24÷ = %=二成= 折.
%=0.25= ÷16= :32.
÷ =0.6= :15= %= 折.
= ÷8=0.125= %=5: .