[]浙江省宁波市鄞州区2019-2020学年七年级上学期期末考试数学试题（扫描版）

扫描全能王 创建 扫描全能王 创建 扫描全能王 创建 扫描全能王 创建 $$ 鄞州区 七年级答案及评分标准 2- 1 鄞州区 2019 年度七年级第一学期期末考试 参考答案和评分标准 一、选择题（每小题3 分，共30 分） 题号 1 2 3 4 5 6 7 8 9 10 答案 B D A C D A D C B A 二、填空题（每小题 3 分，共 18 分） 题号 11 12 13 14 15 16 答案 4 40º -1 5 n3 1 1- -1580 三、解答题（分步计分，共 52 分） 17．（1） 2-2)--- (27 3 2 3 =2-4 ··································· 2分 =-2 ··································· 3分 （2） ） 6 1 9 4 4 9 (14 --36-- + =-1+81-16+6 ·································· 2分 =70 ·································· 3分 18．（1） )2(35 −= xx , 5x=3x-6 ·································· 1分 2x=-6 ·································· 2分 x=-3 ·································· 3分 （2） 1 6 2 3 12 = + − + xx ， 2(2x+1)-(x+2)=6 ··································1分 4x+2-x-2=6 ································· 2分 x=2 ··································3分 19．（1）原式 2 2 2 22(3 2 ) 3(2a 3 )a ab b ab b= − + − + − ·············· 1分 = 2222 936246 babababa +−−+− ··············· 2分 = 2117 bab+- ·················· 3分 （2）∵ 013)17(2 2 =++− ba ∴a= 7 1 ,b=-1 ·································· 5分 ∴原式=1+11=12 ································· 7分 20．（1)如图射线 AB和直线 AC ············· 2分 （2)如图点 D ·············· 3分 （2)如图点 E ··········· 5分 21.（1）10.5-(-4)=14. 5 ···················· 3分 答：销售量最多的一天比销售量最少的一天多销售 14.5千克. •• D E C • A B • • • 鄞州区 七年级答案及评分标准 2- 2 （2）50 7 2 1.5 2.5 6.5 4 10.5 3 358 + − − + − + − = ···············5分 358 (10 6 1) 1074 − − = ··············· 6分 答：该超市这周一共有 1074元利润