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时间:2019-06-20
《2018-2019福州市质检答案》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、2018—2019学年度福州市九年级质量检测数学试题答案及评分标准评分说明:1.本解答给出了一种或几种解法供参考,如果考生的解法与本解答不同,可根据试题的主要考查内容比照评分参考制定相应的评分细则.2.对于计算题,当考生的解答在某一步出现错误时,如果后继部分的解答未改变该题的内容和难度,可视影响的程度决定后继部分的给分,但不得超过该部分正确解答应给分数的一半;如果后继部分的解答有较严重的错误,就不再给分.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.选择题和填空题不给中间分.一、选择题:每小
2、题4分,满分40分.1.A2.B3.D4.B5.C6.D7.C8.B9.C10.B二、填空题:每小题4分,满分24分.11.m(m2)(m2)12.正方体13.甲14.45115.4316.2注:12题答案不唯一,能够正确给出一种符合题意的几何体即可给分,如:某个面是正方形的长方体,底面直径和高相等的圆柱,等.三、解答题:本题共9小题,共86分.解答应写出文字说明、证明过程和演算步骤.317.解:原式331···························································
3、·········6分3311·············································································7分3.················································································8分18.证明:∵∠1∠2,∴∠ACB∠ACD.····································3分B在△ABC和△ADC中,BD,A1C2ACBACD
4、,ACAC,D∴△ABC≌△ADC(AAS),·······················································6分∴CBCD.··········································································8分注:在全等的获得过程中,∠B=∠D,AC=AC,△ABC≌△ADC,各有1分.数学试题答案及评分参考第1页(共6页)2x1x2x119.解:原式2·····························
5、··································1分xx2x1x2····································································3分x(x1)x,·············································································5分x131当x31时,原式····················································6
6、分31131333.···················································8分320.解:BOCDA···········································3分如图,⊙O就是所求作的圆.·······················································4分证明:连接OD.∵BD平分∠ABC,∴∠CBD∠ABD.···············································
7、············5分∵OBOD,∴∠OBD∠ODB,∴∠CBD∠ODB,··························································6分∴OD∥BC,∴∠ODA∠ACB又∠ACB90°,∴∠ODA90°,即OD⊥AC.····································································7分∵点D是半径OD的外端点,∴AC与⊙O相切.·······························
8、·····························8分注:垂直平分线画对得1分,标注点O得1分,画出⊙O得1分;结论1分.21.(1)四边形ABB′A′是菱形.·································································1分证
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