2017福州市一检答案G

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1、福州市2016—2017学年第一学期九年级期末质量检查数学试卷参考答案及评分标准一、选择题（每小题4分，共40分）1．C2．A3．D4．B5．D6．D7．B8．A9．C10．A二、填空题（每小题4分，共24分）11．（0，-1）12．213．点P在⊙O上14．21（或10.5）15．216．m≥132三、解答题(满分86分)17．解：x2+6x+32=-1+32，····················································································3分(x+3)2=8，···

2、····································································································4分x+3=±22，·····································································································6分∴x1=22-3，x2=-22-3．··················································

3、····························8分18．解：∵(x-1)2=1m-1有两个不相等的实数根，4∴1m-1＞0．·····································································································5分4解得m＞4．········································································································

4、·8分19．解：如图所示．···································································································3分DAECB由旋转得ÐCBE=45°，BE=BC=1．······································································4分∵△ABC中ÐC=90°，CA=CB=1，∴ÐCBA=ÐCAB=45°，AB=12+12=2．······················

5、·····································6分∴ÐCBA=ÐCBE．∴A，B，E三点共线．···························································································7分∴AE=AB-BE=2-1．·····················································································8分九年级数学答案—1—（共6页）20．解：（1）0（或

6、1）；······························································································2分（2）列树状图如下：第1枚黑1黑2白1白2第2枚黑2白1白2黑1白1白2黑1黑2白2黑1黑2白1·····························5分由树状图可知，所有可能出现的结果共12种情况，并且每种情况出现的可能性相等．其中摸出两枚棋子的颜色相同(记为事件A)的结果有4种，即（黑1，黑2)，（黑2，黑1)，（白1，白2)，（白2，白1)．·····

7、··································6分∴P(A)=4=1＜1．(或证明1≠2也可以)·····························································7分123233∴“摸出两枚棋子的颜色相同”与“摸出两枚棋子的颜色不同”的概率不相等．···············8分21．解：已知：①③···························································································

8、········1分求证：②···················