[]山西省阳泉市平定县2019-2020学年七年级上学期期末考试数学试题（图片版）

平定县 2019—2020 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 B D D C B D B A A 二、填空题（每小题 3分，共 15分） 11．答案不唯一，例如 433 yx 12．小涵 13．x+2x+1=34 14．3a+2b 15．50 三、解答题（共 65分） 16．解：（1）原式=－16－5－14+26 ······················································ 1分 =－35+26 ·································································· 2分 =－9； ····································································· 4分 （2） 原式=－16÷16－30+27+8····························································· 5分 =－1－30+27+8··································································· 6分 =－31+35··········································································· 7分 =4．················································································· 8分 17． 解：去分母，得 2（x－1）=6－3（2x－3）．································· 1分 去括号，得 2x－2=6－6x+9．···············································2分 移项，得 2x+ 6x=6+9+2．·················································3分 合并同类项，得 8x=17．···························································4分 系数化为 1，得 x= 8 17 ．··························································6分 18．解：原式= 996222 2222  xyyxxyyx ···································1分 = 774 22  xyyx ．·······················································3分 当 x= 1 2  ，y=1时， 原式= 71 2 171 2 14 2 2            ··········································4分 = 7 2 71  ·········································································· 5分 = 2 5 ． ················································································· 6分 19．解：李强同学抽到的四张卡片的计算结果为   45 2 3 2 1       ··································································1分 = 45 2 3 2 1  = 7．··························································································· 2分 张华同学抽到的四张卡片的计算结果为 50 3 11 6 7       ····································································· 3分 = 5 6 8 6 7  = 6 15 ．···························