(1)7.8÷100 7.8×0.01(2)9.8×1.5 9.8×0.5(3)8.7÷0.99 8.7÷1.1(4)5.5×0.9 0.5×9.9.
: =0.125= %==.
9÷ == :8=0.75= %= 折.
=0.375= ÷24= %
:20==0.8=12÷ = %.
6÷ ==0.75= :40= %