320×4的积的末尾有 个0，320×5的积末尾有 个0．
÷5== =0.6=15÷ ．
==0.25==．
15： ==36÷ = %
0.6== ： = ÷ ．
12÷ ==0.375= ：24．
=
=0.6=15÷ ．
=
=0.25=
=
．
=36÷ = %
= ： = ÷ ．
=0.375= ：24．
粤公网安备 44130202000953号