广东省广州花都区2018-2019学年八年级下学期期中考试数学试题（扫描版）

2018学年第二学期八年级数学期中抽测参考答案 一、选择题： 1、 2、 3、 4、 5、 6、 7、 8、 9、 10、 A D D C C C C A B A 二、填空题： 11、 12、 13、 14、 15、 16、 12 18 AB=BC (多个答案) 5 11 三、解答题： 17、（1） 解：原式= ``````````````````````````````4 分 = ``````````````````````````````5分 （2） 解：原式= ``````````````````````````````2分 = ``````````````````````````````3 分 = ``````````````````````````````5分 （3） 解：原式= `````````````````3 分 = ``````````````````````````````5 分 （4） 解：原式= ```````````````````````3 分 = ``````````````````````````````4 分 = -13- ``````````````````````````````5分 18、方法一：（直接代入） 解：当 时， 原式 ``````````````````````````````2 分 ``````````````````````````````7 分 =0````````````````````````````````````````````9 分 方法二：（先变形） 解： ````````````5分 当 时， ````````````````6 分 ```````````````````7分 =2-2 `````````````````````8分 =0 ````````````````````9分 19、解： ``````````````````````````````3分 =3 ``````````````````````````````