2018秋七年级数学上册第一章有理数第3课时有理数(课堂本)课件(新版)新人教版.ppt

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1、巩固提高,精典范例(变式练习),第3课时 有理数,第一章 有理数,例1.在 ,2,0,3.4这四个数中,属于负分数的是( )A B2 C0 D3.4,D,精 典 范 例,,-0.3,变 式 练 习,例2. 把下列各数填入相应的集合中: 23,0.5, ,28,0,4, ,5.2.整数集合: ,正数集合: ,分数集合: ,负数集合: .,-23 , 28 , 0 , 4,精 典 范 例,0,3,变 式 练 习,例3.下列说法正确的是( ) A整数就是正整数和负整数 B分数包括正分数、负分数 C正有理数和负有理数组成全体有理数 D一个数不是正数就是负数,B,精 典 范 例,3.下列说法错误的是(

2、 A.0既不是正数也不是负数 B.一个有理数不是整数就是分数 C.0和正整数是自然数 D.非负有理数就是正有理数,D,变 式 练 习,4. 下列不是有理数的是( ) A.-3.14 B.0.05 C. D.2,D,A,巩 固 提 高,6.既是分数又是正数的是( ) A.+2 B. C.0 D.2.37在有理数4.2,6,0,11, 中,分数有 ,D,-4.2,,-2018,巩 固 提 高,D,9.下面说法正确的是( ) 有理数是正数和负数的统称 有理数是整数 C. 整数一定是正数 D. 有理数包括整数和分数,巩 固 提 高,10把下列各数填在相应的大括号里(将各数用逗号分开): 4,0.62, ,18,0,8.91,+100正数: _负数: 整数: 分数: ,0.62, ,18,+100,4,8.91,4,18,0,+100,0.62, ,8.91,巩 固 提 高,11.把下列各数填在相应的大括号里:整数集合: 分数集合 负整数集合: 正分数集合: 负有理数集合 正有理数集合: ,巩 固 提 高,12.下列说法中,错误的有( ) 是负分数; 1.5不是整数; 非负有理数不包括0; 整数和分数统称为有理数; 0是最小的有理数; -1是最小的负整数. A、1个 B、2个 C、3个 D、4个,C,巩 固 提 高,谢谢!,

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