1.2.1 有理数 课件 2022—2023学年人教版数学七年级上册

1.2.1... text has been truncated due to evaluation version limitation.有理数 学习目标 通... text has been truncated due to evaluation version limitation.分类讨论思... text has been truncated due to evaluation version limitation.. 思考 问题1：在上节课中... text has been truncated due to evaluation version limitation. 问题2：你能进一步... text has been truncated due to evaluation version limitation. 问题3：小数是分数... text has been truncated due to evaluation version limitation. －1，－2，－3，…称为负整数； 像1，2，3，…称为正整数； ，…称为负分数. ，…称为正分数. 那么在以上... text has been truncated due to evaluation version limitation.“－”号后， 有限小数，... text has been truncated due to evaluation version limitation.π）； 分数 无理数 哪些小数可... text has been truncated due to evaluation version limitation. 正整数、0、负整数统... text has been truncated due to evaluation version limitation.正分数、0、负分数统... text has been truncated due to evaluation version limitation.. 整数和分数... text has been truncated due to evaluation version limitation.. 学习新知 有理数 正整数 正分数 负分数 整数 分数 零 负整数 自然数 有理数 正整数 负整数 负分数 正有理数 负有理数 正分数 零 注意：①分类的标... text has been truncated due to evaluation version limitation. ... text has been truncated due to evaluation version limitation. ... text has been truncated due to evaluation version limitation. 按定义分： 按正负分： 有理数分类 注：有限小数和无限循环小... text has been truncated due to evaluation version limitation.都是分数，所以也是有理数. 无限不循环... text has been truncated due to evaluation version limitation.（如π）不是分数，就不是有理数. 巩固练习 1.填空. （1）既是分数... text has been truncated due to evaluation version limitation._____... text has been truncated due to evaluation version limitation.； （2）非负数包... text has been truncated due to evaluation version limitation._____... text has been truncated due to evaluation version limitation.和_____... text has been truncated due to evaluation version limitation.； （3）非正数包... text has been truncated due to evaluation version limitation._____... text has been truncated due to evaluation version limitation.和_____... text has been truncated due