2021年济南市高新区九年级数学第二次模拟测试（含答案和答题卷）

高新区2020-2021年第二学期第二次学考模拟测试 参考答案及评分标准 一、选择题 题号 1 2 3 4 5 6 7 8 9 10 11 12 答案 A C D A B D D A B C A C 二、填空题:（本大题共6个小题，每小题4分，共24分．） 13．（a+3）2． 14．． 15．2． 16．2022． 17．(2，5）． 18． ． 三、解答题:（本大题共12个小题，共78分．解答应写出文字说明、证明过程或演算步骤．） 19．解：原式＝1+2﹣2﹣1·································································································4分 ＝0·············································································································6分 20．解：由①得：x＞1······································································································2分 由②得：x＜4······································································································4分 ∴不等式组的解集为1＜x＜4···················································································5分 则不等式组的整数解为2，3···················································································6分 21．证明：∵四边形ABCD是平行四边形， ∴AB∥CD，AB＝CD，∠BAD＝∠DCB·············································································3分 ∴∠ABE＝∠CDF········································································································4分 ∵AE，CF分别平分∠BAD和∠DCB， ∴∠BAE＝∠BAD，∠DCF＝∠DCB， ∴∠BAE＝∠DCE········································································································5分 ∴△ABE≌△CDF（ASA）·······························································································6分 22．解：（1）40············································································································1分 （2）补全统计图如下： ·································································································3分 （3）54·····················································································································4分 （3）根据题意列表得： ·····················································································5分 共有12种可能出现的结果，并且它们都是等可能的······························································6分 其中都是男生的有6种可能···········