《2025年口算训练六年级数学下册北师大版升级版》

$12 \times 8 \times 0.5 =$ $0.7 \times 0.4 \times 0.1 =$ $0.2 \times 300 \times 12 =$
$12.5 \times 15 \times 0.8 =$ $3.14 \times 50 \times 40 =$ $3.14 \times 0.25 \times 2 =$
$3.14 \times 30 \times 0.1 =$ $3.14 \times 15 \times 0.4 =$ $\frac{1}{3} \times 0.5 \times 12 =$
$\frac{1}{3} \times 450 \times 0.4 =$ $\frac{1}{3} \times 3.14 \times 1.8 =$ $\frac{1}{3} \times 3.14 \times 0.3 \times 70 =$
$\frac{1}{3} \times 3.14 \times 6 \times 0.4 =$ $\frac{1}{3} \times 3.14 \times 150 =$ $\frac{1}{3} \times 3.14 \times 90 =$

答案：

1. 计算圆柱的体积。
$r = 20 \text{ cm}$ $h = 10 \text{ cm}$ $d = 4 \text{ cm}$ $h = 0.2 \text{ cm}$
$V = ( )\text{ cm}^3$ $V = ( )\text{ cm}^3$
$C_{底} = 62.8 \text{ dm}$ $h = 20 \text{ dm}$ $S_{底} = 300 \text{ cm}^2$ $h = 6 \text{ cm}$
$V = ( )\text{ dm}^3$ $V = ( )\text{ cm}^3$

答案：

2. 计算圆锥的体积。
$r = 3 \text{ cm}$ $h = 3 \text{ cm}$ $d = 2 \text{ cm}$ $h = 0.3 \text{ cm}$
$V = ( )\text{ cm}^3$ $V = ( )\text{ cm}^3$
$C_{底} = 12.56 \text{ dm}$ $h = 6 \text{ dm}$ $S_{底} = 150 \text{ cm}^2$ $h = 40 \text{ cm}$
$V = ( )\text{ dm}^3$ $V = ( )\text{ cm}^3$

答案：

一个圆柱的体积比与它等底等高的圆锥体积多$24 \text{ dm}^3$，圆柱的体积是( )$\text{ dm}^3$，圆锥的体积是( )$\text{ dm}^3$。

答案：