从3点到4点,分针旋转了360°. .
:15=9: =10÷ ==0.5.
6:5== %= ÷20= (小数).
= : == ÷10= (填小数).
18÷ ==0.9:0.3=3: = :24.
÷15=0.8==16: = %= 折.