第二章有理数.......................................................................................3§2.1正数和负数.........................................................................31.相反意义的量.............................................................................32.正数与负数.................................................................................4练习.....................................................................................................43.有理数..........................................................................................5练习.......................................................................................................6习题2.1................................................................................................6阅读材料－－中国人最早使用负数..................................7§2.2数轴..........................................................................................81.数轴...............................................................................................8练习.....................................................................................................92.在数轴上比较数的大小...........................................................10练习.....................................................................................................11习题2.2..............................................................................................11§2.3相反数...................................................................................13练习....................................................................................................14习题2.3............................................................................................15§2.4绝对值...................................................................................15练习.....................................................................................................17习题2.4..............................................................................................17§2.5有理数的大小比较......................................................18练习....................................................................................................20习题2.5.............................................................................................21§2.6有理数的加法..................................................................211.有理数加法法则......................................................................21练习.....................................................................................................242.有理数加法的运算律.............................................................25练习.....................................................................................................26习题2.6.............................................................................................27§2.7有理数的减法..................................................................28练习.....................................................................................................29习题2.7.............................................................................................30§2.8有理数的加减混合运算...........................................311.加减法统一成加法...........................
