海关大楼时钟4时敲4下,6秒钟敲完,那么8时敲8下,要 秒敲完.
= : =75%=3÷ = .(填小数)
10÷ = :75== %= (填小数).
÷4=2=3=.
÷ = %=0.375=.
3: ==24÷ = %=五折=.