3时整,钟面上的时针和分针所成的角是 角;2时整,钟面上的时针和分针所成的角是 角.
9: ==3÷5.
3÷4==27: = (填小数)= %.
÷4==0.25= :8.
=9÷ = :8== (填小数)
3: ==15÷ = ×= (小数).