发布时间 : 星期四 文章2017-2018年陕西省西安市高新一中初一上学期期末数学试卷与答案更新完毕开始阅读e6143ee0cbaedd3383c4bb4cf7ec4afe05a1b144
答：将最后一名乘客送到目的地时，小李距下午出发地点的距离是0千米；若汽车耗油量为a公升/千米，这天下午汽车共耗油118a公升．
26．（9分）根据如图所示的数轴，解答下面问题
（1）分别写出A、B两点所表示的有理数； （2）请问A、B两点之间的距离是多少？
（3）在数轴上画出与A点距离为2的点（用不同于A、B的其它字母表）．
【解答】解：（1）根据所给图形可知A：1，B：﹣2；
（2）依题意得：AB之间的距离为：1+2=3；
（3）设这两点为C、D，
则这两点为C：1+2=3，D：1﹣2=﹣1． 如图所示：
27．（9分）某种水果第一天以2元的价格卖出a斤，第二天以1.5元的价格卖出b斤，第三天以1.2元的价格卖出c斤，求： （1）三天共卖出水果多少斤？ （2）这三天共卖了多少元？
（3）三天的平均售价是多少？并计算当a=30，b=40，c=45时，平均售价的数值．
【解答】解：（1）三天共卖出水果：a+b+c； （2）这三天共卖了：2a+1.5b+1.2c； （3）平均售价=
当a=30，b=40，c=45时，
=
，
=．Baidubaidu badiubaidubaidubaidu 第13页（共14页）
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第14页（共14页）