目录
1．1 正数和负数 ........................................................................................................................... 1 1．2 有理数 ................................................................................................................................. 10
1．2.1 有理数 ...................................................................................................................... 10 1.2.2 数 轴 ......................................................................................................................... 19 1.2.3 相反数 ......................................................................................................................... 25 1.2.3 相反数 ....................................................................................................................... 27 1．2.4 绝对值 ...................................................................................................................... 29
第1课时 绝对值 ......................................................................................................... 29 第2课时 有理数大小的比较 ..................................................................................... 35
1．3 有理数的加减法 ................................................................................................................. 41
1．3.1 有理数的加法 .......................................................................................................... 41
第1课时 有理数的加法法则 ..................................................................................... 41 第2课时 有理数加法的运算律及运用 ..................................................................... 46 1．3.2 有理数的减法 .......................................................................................................... 52
第1课时 有理数的减