江苏省无锡市宜兴市2023—2024学年八年级下学期期中考试数学试题（PDF含答案）

2024 年春学期宜兴市八年级数学期中考试参考答案与评分标准 一、选择题（本大题共 10 小题，,每小题 3 分，共 30 分．） 1． B 2．C 3．A 4．C 5．D 6． B 7．D 8．D 9．D 10．C 二、填空题（本大题共 8 小题，每小题 3 分，共 24 分．） 11．65． 12．2． 13．0.24． 14． 9 3m 且m ． 2 2 7 8 24 15． ． 16．50 ． 17． ． 18．3． 3 3 5 三、解答题（本大题共 8 小题，共 66 分．） 19. （本题满分 8 分） 解：（1）原式 (a b) (a b) a b ·························································································· 2 分 (a b) (a b) a 2a a b 2 ． ···································································································· 4 分 (a b) (a b) a a b （2）两边同乘 (2x 4) 得： x 5 6x 14 2x 4， ····························································· 1 分 5 整理得：3x 5，得： x ， ·································································································· 2 分 3 5 5 经检验： x 是原方程的根，所以，原方程的根是 x ． ················································ 4 分 3 3 20. （本题满分 8 分） x2 1 3 x(x 1) 解：原式 x(x 2) ··················································································· 6 分 x 1 (x 2)2 x 2 当 x 1时，原式 1 ． ············································································································· 8 分 3 21．（本题满分 8 分） 解：（1）40； ······························································································································· 2 分 喜欢足球 40 30% 12人，喜欢跑步 40 10 15 12 3人(图略) ······················· 4 分 15 （2）360 135 ··········································································································· 6 分 40 15 12 （3）估计全校最喜爱篮球的人数比最喜爱足球的人数多1600 120 人． ······ 8 分 40 22．（本题满分 8 分） 解：（1）249、0.4 ······················································································································ 4 分 （2）0.4 （3）18 ······································· ... ...