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时间:2019-03-04
《哈尔滨市南岗区一模数学及答案》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、2015年初中升学考试调研测试(一)数学试卷参考答案及评分标准一、选择题(每小题3分,共计30分)题号12345678910答案BADCBDCACA二、填空题(每小题3分,共计30分)题号11121314151617181920答案3a(mn)21x306361或5332752x2三、解答题(21—22题各7分,23—24各8分,25—27题各10分,共计60分)21.(本题满分7分)mmnnmmn1解:原式=.....................................4分(mn)(mn)m
2、n(mn)(mn)mmn2333m22,n...............................................................................................2分2222112原式=..........................................................................................................1分332222222.(本题满分7分
3、)(1)画图正确...............................................................................................................................................3分B1坐标为(0,2).........................................................................................................
4、...........................1分(2)画图正确.................................................................................................................................................3分23.(本题满分8分)(1)解:60.1250(户),m500.2412,n500.3216(户)............................
5、.........3分(2)补图正确..................................................................................................................................................2分(3)解:1500(10.120.240.320.20)180(户)..............................................2分估计该小区月平均用水量超过
6、20t的家庭大约有180户...............................................................1分24.(本题满分8分)(1)过点D作AB的垂线交AB的延长线点H.在△BDH中∵DH与水平线平行∴∠BDH=30°.....................................................................1分3DHDH∴cosBDHcos30DH33(米)..............................
7、................3分2BD6即广告牌与铁塔AB之间的水平距离为33米.1BHBH(2)由(1)可知sinBDHsin30BH3(米)2BD6A45°过点C作AB的垂线,垂足为点K.在△ACK中∵CK与水平线平行∴∠ACK=45°...................................1分∴∠CAK=∠ACK=45°∴AK=CKCK在四边形CDHK中CD//HKCKHKHDHDC90B∴四边形CDHK为矩形∴KH=CD=4(米)CK=DH=33D30°H(米).....
8、........................................................................................................................2分(第
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