You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
5 lines
123 B
5 lines
123 B
1 month ago
|
话题18 用小数定义有理数和无理数
|
||
|
|
||
|
话题19 乘法的定义
|
||
|
|
||
|
话题20 除法运算规定0不能为除数
|