平谷区2018-2019学年第一学期期末七年级数学试题及答案

最专业K12教研共享平台初一数学试卷答案第1页（共4页）平平谷区谷区2018—2019学年度第一学期期末质量监控学年度第一学期期末质量监控初一数学初一数学参考答案及评分标准参考答案及评分标准2019．1一、选择题（本题共一、选择题（本题共16分，每小题分，每小题2分分）二、填空题（本题共二、填空题（本题共16分，每小题分，每小题2分）分）题号910111213141516答案ba213+-4;5370-1PD;垂线段最短xx240)12(150=+6;3三、三、解答题（本题共50分，每小题5分）17．解：)20(23)6(17−−+−+−=2023617++−−·····································································································2分=202323++−··········································································································4分=20···························································································································5分18．解：)827(1655.2原式−−==82751625·····························································································3分=27····················································································································5分19．解：24)433281(−+=244324322481−+················································································