江苏省南京市联合体2022-2023学年八年级下学期数学期末试卷(图片版含答案)

2022~2023学年度第二学期期末学情分析样题八年级数学参考答案 一、选择题 (本大题共 6 小题，每小题 2 分，共 12 分) 题号 1 2 3 4 5 6 答案 D C D D C B 二、填空题 (本大题共 10 小题，每小题 2 分，共 20 分) 7．x≠2 8．mn 9 5 2． 10．抽样调查 11．0.8 2 12．＜ 13．22 14 120 180． ＝ 15．2＜k≤8 16 9． x x＋3 14 三、解答题（本大题共 10 小题，共 68 分） 17．（本题 6分） （1）解：原式＝(2 3－ 3) 1× ······························································· 1分 3 1 ＝ 3× ····························································································2分 3 ＝1······································································································ 3分 （2）方法一：解：原式＝(5－1)－(6－2 5)···················································· 2分 ＝2 5－2······························································································ 3分 方法二：解：原式＝( 5－1)( 5＋1－ 5＋1)··················································2分 ＝2 5－2······························································································ 3分 18．（本题 6分） 1 (x＋3 1 x＋3解：（ ）原式＝ － )× ．···············································3分 x＋3 x＋3 (x＋2)(x－2) x＋2 x＋3 ＝ × ．············································································ 4分 x＋3 (x＋2)(x－2) 1 ＝ ．·······························································································5分 x－2 当 x＝1时，原式＝－1．········································································· 6分 19．（本题 6分） 解：方程两边都乘以(x＋1)(x－1)得，(x＋1)2－4＝(x＋1)(x－1)，······················2分 解得，x＝1，·························································································4分 检验：当 x＝1时，(x＋1)(x－1)＝0，··························································5分 ∴x＝1是增根， ∴原分式方程无解．···························································· ... ...