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ID:20056503
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时间:2018-10-08
《2005年广东省中山市初中毕业生学业考试数学试卷答案》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、2005年广东省中山市基础教育课程改革实验区初中毕业生学业考试数学试卷参考答案一、选择题1、A2、C3、B4、C5、D二、填空题6、 7、 8、7和8 9、4 10、40三、解答题11、解:12、解:13、作图如下:14、解:⑴⑵当时yearsmortgagehousing;4.mortgageregistrationformalitiesarecompleted.(D)pledge1.borrower(includingthepledgor)between18-65yearsofage,with
2、fullcivilcapacity;2.collateral15、解:⑴“翻到奖金1000元”的概率为⑵“翻到奖金“的概率;⑶“翻不到奖金”的概率。四、解答题16、解:⑴当0≤≤15时,过点,设∴∴(0≤≤15)当≥15时,过点A,B设则解得∴(≥15)⑵因为∴(元)17、解:过点A作AD⊥BC于D点。在Rt△ABD中,∵∠ABC=45°,∴BD=AD∵BC=20,∴CD=BC-BD=20-ADyearsmortgagehousing;4.mortgageregistrationformalities
3、arecompleted.(D)pledge1.borrower(includingthepledgor)between18-65yearsofage,withfullcivilcapacity;2.collateral在Rt△ACD中,∵∴AD=CD即AD=∴AD=答:小河的宽度约为7.32米。⑵先取点A,测量得∠ABC=90°处取点B,然后取∠ACB=30°,量出BC的长度。18、解:⑴⑵∵∴19、解:⑴略.⑵79.5~89.5分数段的学生最多;49.5~59.5分数段的学生最少。⑶及格率为:优秀
4、率为:20、⑴证明:∵ABCD是等腰梯形,M是AD的中点∴BM=CM(ABMCDM)yearsmortgagehousing;4.mortgageregistrationformalitiesarecompleted.(D)pledge1.borrower(includingthepledgor)between18-65yearsofage,withfullcivilcapacity;2.collateral又∵N、E、F分别为BC,MB,CM的中点∴四边形MENF是菱形⑵若菱形MENF是正方形,则∠
5、BMC=90°,∴∠MBC=∠MCB=45°,在Rt△MNB中,∠MBC=45°,∴MN=BN又∵MB=NC∴MN=BC即等腰梯形ABCD的高MN=BC21、解:设原计划每天开空调的时间为x小时,依题意可得:解得:86、rrower(includingthepledgor)between18-65yearsofage,withfullcivilcapacity;2.collateral当时,.⑶存在.yearsmortgagehousing;4.mortgageregistrationformalitiesarecompleted.(D)pledge1.borrower(includingthepledgor)between18-65yearsofage,withfullcivilcapacity;2.collate7、ral
6、rrower(includingthepledgor)between18-65yearsofage,withfullcivilcapacity;2.collateral当时,.⑶存在.yearsmortgagehousing;4.mortgageregistrationformalitiesarecompleted.(D)pledge1.borrower(includingthepledgor)between18-65yearsofage,withfullcivilcapacity;2.collate
7、ral
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