秒针走30秒,就是秒针在钟面上从0走到6. .(判断对错,对的打“√”.错的打“×”)
0.35===( )÷( )=.
:20=3: =0.2== %
=== ÷12.
18÷ == ÷5= .
=0.625==15÷ .