广场上的大钟5时敲5下,l0秒钟敲完;12时敲l2下,24秒钟敲完. .(判断对错)
: =0.75= = %.
=0.75=9: .
== ÷ == (填小数)
=0.4= ÷ =.
= ÷48=3:8= %