问题
填空题
用科学记数法表示数90400为 。
答案
题目分析：科学记数法的表示形式为
的形式，其中
，n为整数．确定n的值时，要看把原数变成a时，小数点移动了多少位，n的绝对值与小数点移动的位数相同．当原数绝对值＞1时，n是正数；当原数的绝对值＜1时，n是负数．
点评：本题属于基础应用题，只需学生熟练掌握科学记数法的表示方法，即可完成。
搜题请搜索小程序“爱下问搜题”
用科学记数法表示数90400为 。
题目分析：科学记数法的表示形式为的形式，其中，n为整数．确定n的值时，要看把原数变成a时，小数点移动了多少位，n的绝对值与小数点移动的位数相同．当原数绝对值＞1时，n是正数；当原数的绝对值＜1时，n是负数．
点评：本题属于基础应用题，只需学生熟练掌握科学记数法的表示方法，即可完成。
| 改错题。 | |
| Yesterday I was tidy my room. I found an old | 1.__________________ |
| box of my father. He gave it to me two years ago. It | 2.__________________ |
| was real interesting to discover some of my father’s | 3.__________________ |
| childhood hobbies. He once told me that he wrote for | 4.__________________ |
| people all over the world, and they sent he letters, too. | 5.__________________ |
As a result, he had some wonderful stamp. People also | 6.__________________ |
| gave him things from different countries, such like a silk | 7.__________________ |
| fan from Japan but a small model ship from Australia. | 8.__________________ |
| My father even kept the ticket from his one football match! | 9.__________________ |
| It made me to think about looking after my collections. | 10.__________________ |