[]山西省平定县2018-2019学年七年级上学期期末考试数学试题（图片版）

平定县 2018—2019 学年第一学期期末教学质量检测试题 七年级数学参考答案 一、选择题（每小题 2分，共 20分） 题号 1 2 3 4 5 6 7 8 9 10 答案 C D B A C D D C B A 二、填空题（每小题 3分，共 15分） 11. 答案不唯一，例如－3 12.－3 13.3 14.义 15.1.6 三、解答题（共 65分） 16. 解：（1）原式 1 3 16 ( ) 4 6 4 12        ············································· 1分 1 3 124 ( ) 6 4 12       ················································ 2分 4 18 2   ······························································· 3分 12  ． ···································································4分 （2） 原式= 19 3 8 4     （ ）·······························································6分 = 3 2  ············································································7分 =－1················································································8分 17. 解：去分母，得 2(2 3 ) 3( 5) 12x x    ．····································· 1分 去括号，得 4 6 3 15 12x x    ．······································ 2分 移项，得 6 3 12 4 15x x     ．··························· 3分 合并同类项，得 9 7x   ．······································ 4分 系数化为 1，得 7 9 x  ．······································· 6分 18．解：原式= 22 4 4 2 1x x x    ······················································ 1分 = 22 6 5x x  ．································································2分 当 x= 1 2  时， 原式= 21 12 ( ) 6 ( ) 5 2 2       ························································· 4分 1 3 5 2    ············································································5分 3 2   ． ···············································································6分 19．解：如图： ············································································ 4分 两点之间，线段最短．·································································· 6分 20．解：根据题意得 A=9x2－2x+7－2（x2+3x－2）························································· 2分 =9x2－2x+7－2x2－6x+4································································· 3分 =（9－2）x2－（2+6）x+4+7·········································