1. 题目要求将除法算式转换成小数和分数形式。 2. 除法转小数的规则是：$a \div b = \frac{a}{b}$，然后计算小数值。 3. 例如： - $9 \div 10 = 0.9 = \frac{9}{10}$ - $25 \div 100 = 0.25 = \frac{25}{100}$ - $180 \div 1000 = 0.18 = \frac{180}{1000}$ 4. 继续完成剩余题目： - $4 \div 5 = 0.8 = \frac{4}{5}$ - $20 \div 40 = 0.5 = \frac{20}{40}$ - $3 \div 4 = 0.75 = \frac{3}{4}$ - $97 \div 100 = 0.97 = \frac{97}{100}$ - $1 \div 8 = 0.125 = \frac{1}{8}$ - $7 \div 20 = 0.35 = \frac{7}{20}$ - $20 \div 100 = 0.2 = \frac{20}{100}$ - $6 \div 10 = 0.6 = \frac{6}{10}$ - $30 \div 60 = 0.5 = \frac{30}{60}$ - $10 \div 50 = 0.2 = \frac{10}{50}$ 5. 第二部分是单位换算，转换为更大单位： - $28\text{cm} = 0.28\text{m} = \frac{28}{100}\text{m}$ - $230\text{g} = 0.23\text{kg} = \frac{230}{1000}\text{kg}$ - $450\text{cm}^2 = 4.5\text{dm}^2 = \frac{450}{100}\text{dm}^2$ - $4620\text{dm}^3 = 4.62\text{m}^3 = \frac{4620}{1000}\text{m}^3$ - $550\text{mL} = 0.55\text{L} = \frac{550}{1000}\text{L}$ - $30\text{分} = 0.5\text{小时} = \frac{30}{60}\text{小时}$ - $250\text{千克} = 0.25\text{吨} = \frac{250}{1000}\text{吨}$ - $80\text{毫米} = 0.8\text{分米} = \frac{80}{100}\text{分米}$ - $700\text{米} = 0.7\text{千米} = \frac{700}{1000}\text{千米}$ - $25\text{dm}^2 = 0.25\text{m}^2 = \frac{25}{100}\text{m}^2$ - $300\text{cm}^3 = 0.3\text{dm}^3 = \frac{300}{1000}\text{dm}^3$ - $50\text{cm} = 0.5\text{m} = \frac{50}{100}\text{m}$ - $600\text{mm} = 0.6\text{m} = \frac{600}{1000}\text{m}$ 6. 以上均为单位换算的基本规则，分数形式即为除数分母，换算成小数即为除法结果。最终答案见步骤中对应转换。