江西省南昌市2007年初中毕业暨中等学校招生考试数学.doc

江西省南昌市 2007 年初中毕暨中等学校招生考试数学试题参考答案及评分意见说明: 1. 如果考生的解答与本参考答案不同, 可根据试题的主要考查内容参照评分标准制定相应的评分细则后评卷. 2. 每题都要评阅到底, 不要因为考生的解答中出现错误而中断对该题的评阅, 当考生的解答在某一步出现错误,影响了后继部分时,如果该步以后的解答未改变这一题的内容和难度,则可视影响的程度决定后面部分的给分;但不得超过后面部分应给分数的一半; 如果这一步以后的解答有较严重的错误,就不给分. 3 .解答右端所注分数,表示考生正确做到这一步应得的累加分数. 4 .只给整数分数. 一、选择题(本大题共 8 小题,每小题 3 分,共 24 分) ;;;;;;; 二、填空题(本大题共 8 小题,每小题 3 分,共 24 分) ; ; ; ?; 13 .答案不惟一,如 5; BC EF ?(或 A D ? ??); ??,23x?; 16 .如图: 三、(本大题共 4 小题,每小题 6 分,共 24 分) 17 .解:原式 3 1 ( 3 1) 2 2 ? ? ???································································· 3分 1 3 1 3 ? ???·········································································· 4分 0?···························································································· 6分 18 .解:原式 22 4 4 2 ( 4) a a a a ? ????········································································ 2分 22 ( 2)( 2) a a a a a ??? ?································································ 4分 2 aa ??······················································································· 7分 19 .解:树形图: 第一张卡片上的整式 x1x? 2 (第 16 题) AOEB F 第二张卡片上的整式 1x? 2x2x1x?所有可能出现的结果 1 xx?2 x1xx ?12 x?2x 21x?···················································································································· 4分也可用表格表示: 第一张卡片上的整式第二张卡片上的整式 x1x?2 x1 xx?2