从圆锥高的处切下一个圆锥,这个圆锥的体积是原来体积的. .(判断对错)
:4=0.75=9: =.
=3÷ =0.5= :10= %
=9÷ = :16= %= 填小数.
.
÷30=2÷5=18: = %