圆柱底面半径是10米,高9米,它的体积是 立方米,与它等底等高的圆锥体积是 立方米.
8÷ = :4=0.25== %== ÷45=3: = %==.
= %= ÷40=40: .
32÷ == :8= %= (小数)
填上适当的数.= (小数)= %= ÷ = =× = =+ = ﹣.
3÷( )= =15%= :40 圆周率是 与 的比值.