《2025年口算训练六年级数学下册北师大版升级版》

$8 \times 10 \times 1.25 =$ $0.4 \times 0.8 \times 0.5 =$ $32 \times 10 \times 0.2 =$
$0.16 \times 5 \times 2 =$ $0.8 \times 0.1 \times 0.6 =$ $6 \times 0.12 \times 10 =$
$0.7 \times 3 \times 0.3 =$ $7.5 \times 0.2 \times 1 =$ $60 \times 4 \times 0.5 =$
$50 \times 0.35 \times 2 =$ $2.5 \times 3.9 \times 4 =$ $0.9 \times 2.5 \times 0.4 =$
$0.1 \times 2 \times 1.5 =$ $4 \times 33 \times 0.25 =$ $0.2 \times 10 \times 0.47 =$
$0.5 \times 6 \times 0.8 =$ $0.5 \times 10 \times 0.4 =$ $9 \times 0.2 \times 3 =$

答案：

计算圆柱的表面积和体积。
$r = 1\text{ cm}$ $h = 1\text{ cm}$ $d = 0.2\text{ dm}$ $h = 0.2\text{ dm}$
$S_{表} =$ $S_{表} =$
$V =$ $V =$
$C = 6.28\text{ cm}$ $h = 20\text{ cm}$ $S_{底} = 12.56\text{ cm}^2$ $h = 4\text{ cm}$
$S_{表} =$ $S_{表} =$
$V =$ $V =$

答案：

把圆锥的半径扩大到原来的2倍，高扩大到原来的3倍，圆锥的体积扩大到原来的( )倍。

答案：