《2025年口算训练五年级数学下册人教版升级版》

1. 口算。
$410 + 320 =$ $410 - 320 =$ $410 \times 3 =$
$41 + 32 =$ $41 - 32 =$ $41 \times 3 =$
$4.1 + 3.2 =$ $4.1 - 3.2 =$ $4.1 \times 0.3 =$
$0.41 + 0.32 =$ $0.41 - 0.32 =$ $0.41 \times 0.03 =$
$420 \div 20 =$ $42 \div 2 =$ $4.2 \div 0.2 =$
$1.25 \times 8 =$ $1.25 \times 8.8 =$ $1.25 \times 8.88 =$
$66 \div 22 =$ $0.66 \div 0.22 =$ $66.66 \div 22 =$
$1.4 \times 5 + 5 =$ $1.5 \times 4 + 4 =$ $1.5 \times 4 - 4 =$
$3.2 + 3.2 \times 0.5 =$ $(3.2 + 3.2) \times 0.5 =$ $3.2 - 3.2 \times 0.5 =$
$2.5 + 7.5 \div 5 =$ $(2.5 + 7.5) \div 5 =$ $7.5 - 2.5 \div 5 =$
$(7.5 - 2.5) \div 5 =$ $5 \div 2.5 + 7.5 =$ $5 \div (2.5 + 7.5) =$
$7.5 \times 5 + 2.5 \times 5 =$ $7.5 \div 5 + 2.5 \div 5 =$ $7.5 \times 5 \div 7.5 \times 5 =$

答案：

2. 下面两个图分别是一个立体图形从正面和左面看到的图形，请你想一想，从上面看到的图可能是怎样的？至少画出2种。

答案：