把一个体积是15cm3的圆柱削成最大的圆锥,圆锥的体积是5cm3. .
5÷ =1.25== :28.
60%= :15== ÷20= (写小数)
:10=18: =50%=6: = ÷60.
35: =20÷16== %= (填小数)
:3=10: ==1.5: .