山东省菏泽市鄄城县2025新教材七年级下册数学期中试题（PDF版，含答案）

七年级数学参考答案 时间：120 分钟 总分：120 分 一、选择题（本大题共 10 个小题，每小题 3 分，共 30 分，在每道小题给出的四个选项中，只有一个选 项是正确的，请把正确选项的序号涂在答题卡的相应位置.） 题号 1 2 3 4 5 6 7 8 9 10 答案 A B D C D A B B C A 二、填空题（本大题共 5 个小题，每小题 3 分，共 15 分，只要求把最后结果填写在答题卡的相应区域 内） 11．6.67 10 11 12 1． 4 13．28° 14．1 15． a1∥ a 2025（或填“平行”） 三、解答题(本题共 8 小题，共 75 分，把解答或证明过程写在答题卡的相应区域内) 8 16．（本小题满分 8 分）（1） （2） 4a3b4 9 ······························· 每题 4 分，共 8 分 17．（本小题满分 8分）解：（1）1．···············································2分 （2 1 1）她得到一把雨伞的概率为 ；·································· 5分 1 2 12 15 2 2 她得到一个文具盒的概率为 ．······································ 8分 1 2 12 15 18 2．（本小题满分 8分）解： (a 3b)( a 3b) (2a 3b) 5a(a 4b) 2a 9b2 a2 4a2 12ab 9b2 5a2 20ab 2a 9b2 a2 4a2 12ab 9b2 5a2 20ab 2a 10a2 32ab 2a 5a 16b ···············································································5分 5 1 16 ( 2) 37 ································································· 8分 19. （本小题满分 9分） 解：（1）∵AB∥DG， 试卷第 1页，共 4页 ∴∠BAD＝∠1， ∵∠1+∠2＝180°， ∴∠BAD+∠2＝180°， ∴AD∥EF；············································································ 4分 （2）∵∠1+∠2＝180°，∠2＝142°， ∴∠1＝38°， ∵DG是∠ADC的平分线， ∴∠CDG＝∠1＝38°， ∵AB∥DG， ∴∠B＝∠CDG＝38°．······························································ 9分 20. （本小题满分 9分） 解： (2a3b2 3a2b 4a) ( 2b) 4a3b3 6a2b2 8ab 4 (ab)3 6(ab)2 8ab 4 33 6 32 8 3 108 54 24 78．······················································································9分 21.（本小题满分 10分） 解：（1）①③；········································································2分 93 （2）m 0.31，···································································4分 300 n 334 0.334，··································································6分 1000 随着转动次数的增加，估计随机转动转盘“指针指向黄色区域”的概率为 0.3；....................8分 （3）将 1个绿色区域改为蓝色区域，能使指针指向每种颜色区域的可能性相同．....................10分 22．（本小题满分 10 分） （1 2 2） a ... ...