福建省福州市2020届九年级下学期质量检测（二检）数学试题（图片版）

九年级数学试题答案及评分参考第 1 页（共 6 页） A F D E B C 数学试题答案及评分参考 评分说明： 1．本解答给出了一种或几种解法供参考，如果考生的解法与本解答不同，可根据试题的主要考 查内容比照评分参考制定相应的评分细则． 2．对于计算题，当考生的解答在某一步出现错误时，如果后继部分的解答未改变该题的内容和 难度，可视影响的程度决定后继部分的给分，但不得超过该部分正确解答应给分数的一半； 如果后继部分的解答有较严重的错误，就不再给分． 3．解答右端所注分数，表示考生正确做到这一步应得的累加分数． 4．只给整数分数．选择题和填空题不给中间分． 一、选择题：共 10 小题，每小题 4分，满分 40 分；在每小题给出的四个选项中，只有一项是符合题目要求的， 请在答题卡的相应位置填涂． 1．A 2．C 3．A 4．B 5．B 6．A 7．B 8．C 9．C 10．D 二、填空题：共 6 小题，每小题 4 分，满分 24 分，请在答题卡的相应位置作答． 11．1 12． 1 4 13．15 14．4 15．18 16． 9 4 三、解答题：共 9 小题，满分 86 分，请在答题卡的相应位置作答． 17．（本小题满分 8 分） 解：解不等式①，得 x≤3． ······························································································ 3 分 解不等式②，得 x＞ 1 ． ···························································································· 5 分 ∴原不等式组的解集是 1 ＜x≤3， ··············································································· 6 分 将该不等式组解集在数轴上表示如下： ······························································· 8 分 18．（本小题满分 8 分） 证明：∵点 E，F在 BC上，BE CF， ∴BE  EF CF  EF， 即 BF CE． ········································································································· 3 分 在△ABF和△DCE中， AB DC B C BF CE       ， ， ， ∴△ABF≌△DCE， ······························································································· 6 分 ∴∠A∠D． ······································································································· 8 分 1 2 3 4 5-1-2-3 -4-5 0 九年级数学试题答案及评分参考第 2 页（共 6 页） 19．（本小题满分 8 分） 解：原式 2 2 1 ( 1) ( 1) ( 1) x x x x       ······················································································· 3 分 2 ( 1)( 1)1 1 1 x xx x x      ·························································································· 4 分 2 21 1 1 1 x x x x      ·································································································· 5 分 2 1x   ． ··································