四川省资阳市安岳县2018—2019学年下学期期末教学质量监测义务教育七年级数学试卷

1 安岳县2018—2019 学年度第二学期期末教学质量监测义务教育七年级 数学答案 一、选择题（共 10 小题，每小题 4 分） 题号 1 2 3 4 5 6 7 8 9 10 答案 B D C A C B A D A D 二、填空题（共 6 小题，每小题 4 分） 11. -1 12． 18cm 或 21cm 13．24 14. -9 15 . 95 ° 16 . 96 三、解答题（共 9 小题） 17．解：（1） 5x ···························································································· 4 分 （2）      1 1 y x ···································································································· 10 分 18．解：（1）解不等式组为      1 2 x x ······································································ 2 分 所以原不等式组的解集为 21  x ····································································· 4 分 （2）图形略 ······································································································· 6 分 （3）整数解为：-1，0，1·················································································· 8 分 19．解：（1）如图所示 ························································································ 2 分 （2）如图所示 ···································································································· 5 分 （3）成轴对称 ···································································································· 6 分 对称轴如图所示. ································································································ 8 分 20．解：解方程   xxx  513 ，得： 2x . ··················································· 3 分 由题意可得方程 1 3 1 2     kkx 的解为 2x ， ······················································· 4 分 则有 1 3 1 2 2     kk ，························································································ 5 分 得：     61223  kk ， 62236  kk ， 解得： 2k ····································································································· 8 分 2 21．解：（1）∵∠B=32°，∠C=70°， ∴∠ BAC=180°-∠B-∠C=78°， ···························· 2 分 ∵AE 平分∠BAC， ∴∠ BAE ∠= EAC= 2 1 ∠BAC=39 ° . ··········