学校 姓名 班级___________ 座位号 ……装…………订…………线…………内…………不…………要…………答…………题……
一、选择题(每题3分, 共30分)
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3
1.要使分式有意义,则x的取值范围是( )
x-1A.x≠1 B.x>1 C.x<1 D.x≠-1 2.下列图形中,是轴对称图形的是( )
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A B C D 3.如图,若△ABE≌△ACF,且AB=5,AE=2,则EC的长为( )A.2 B.3 C.5 D.2.5
第3题 第6题 第8题 4.下列因式分解正确的是( )
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A.m2+n2=(m+n)(m-n) B.x2+2x-1=(x-1)2 C.a2-a=a(a-1) D.a2+2a+1=a(a+2)+1 5.下列说法:①满足a+b>c的a,b,c三条线段一定能组成三角形;②三角形的三条高交于三角形内一点;③三角形的外角大于它的任何一个内角.其中错误的有( )
A.0个 B.1个 C.2个 D.3个
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6.如图,AB∥DE,AC∥DF,AC=DF,下列条件中,不能判定△ABC≌△DEF的是( ) A.AB=DE B.∠B=∠E C.EF=BC D.EF∥BC 7.已知2m+3n=5,则4m·8n=( )
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A.16 B.25 C.32 D.64
8.如图,在△ABC中,AB=AC,∠BAC=100°,AB的垂直平分线DE分别交AB,BC于点D,E,则∠BAE=( )
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ay use the contents or services of this article forA.80° B.60° C.50° D.40°
9.“五·一”江北水城文化旅游节期间,几名同学包租一辆面包车前去旅游,面包车的租价为180元,出发时又增加了两名同学,结果每名同学比原来少摊了3元钱车费,设原来参加游览的同学共x名,则所列方程为( )
180180180180180180180180A.-=3 B.-=3 C.-=3 D.-=3
xxx+2x-2xx+2xx-2
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10.如图,过边长为1的等边三角形ABC的边AB上一点P,作PE⊥AC于点E,Q为BC延长线上一点,当AP=CQ时,PQ交AC于D,则DE的长为( )
112
A. B. C. D.不能确定 323
二、填空题(每题3分,共30分)
-
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ay use the contents or services of this article for11.计算:(-2)0·23=________,(8a6b3)2÷(-2a2b)=________.12.点P(-2,3)关于x轴的对称点P′的坐标为________.13.分解因式:(a-b)2-4b2=__________.
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ay use the contents or services of this article for14.一个n边形的内角和为1080°,则n=________.
15.如图所示,AB=AC,AD=AE,∠BAC=∠DAE,点D在线段BE上.若∠1=25°,∠2=30°,则∠3=______.
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(第15题) (第16题) (第17题)
16.如图,已知△ABC中,∠BAC=140°,现将△ABC进行折叠,使顶点B,C均与顶点A重合,则∠DAE的度数为________.
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17.如图,已知正六边形ABCDEF的边长是5,点P是AD上的一动点,则PE+PF的最小值是________. 18.雾霾已经成为现在生活中不得不面对的重要问题,PM2.5是大气中直径小于或等于0.000 002 5米的颗粒物,0.000 002 5用科学记数法表示为________.
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ay use the contents or services of this article forax+119.若关于x的方程-1=0有增根,则a=________.
x-1
20.在平面直角坐标系xOy中,已知点P(2,2),点Q在坐标轴上,△PQO是等腰三角形,则满足条件的点Q共有________个.
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三、解答题(23题6分,24题10分,27题12分,其余每题8分,共60分)
8?y-6y+9?y-1-21.计算:(1)y(2x-y)+(x+y); (2)y+1?÷y2+y. ?
2
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1
22.(1)化简求值:(2+a)(2-a)+a(a-2b)+3a5b÷(-a2b)4,其中ab=-. 2
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(2)因式分解:a(n-1)2-2a(n-1)+a.
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23.解方程:
13x32(1)-2=; (2)=.2xx+1x-33-x
24.如图,已知网格上最小的正方形的边长为1.(1)分别写出A,B,C三点的坐标;
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(2)作△ABC关于y轴的对称图形△A′B′C′(不写作法),想一想:关于y轴对称的两个点之间有什么关系? (3)求△ABC的面积.
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(第24题)
1
25.如图,△ABC中,AB=AC,∠BAC=90°,点D在线段BC上,∠EDB=∠C,BE⊥DE,垂足
2为E,DE与AB相交于点F.试探究线段BE与DF的数量关系,并证明你的结论.
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(第25题)
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26.在“母亲节”前夕,某花店用16 000元购进第一批礼盒鲜花,上市后很快销售一空,根据市场需1
求情况,该花店又用7 500元购进第二批礼盒鲜花.已知第二批所购鲜花的盒数是第一批所购鲜花的,且
2
每盒鲜花的进价比第一批的进价少10元.问第二批鲜花每盒的进价是多少元?
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27.如图,在平面直角坐标系中,已知点A(a-1,a+b),B(a,0),且|a+b-3|+(a-2b)2=0,C为x轴上点B右侧的动点,以AC为腰作等腰三角形ACD,使AD=AC,∠CAD=∠OAB,直线DB交y轴于点P.
(1)求证:AO=AB;
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ay use the contents or services of this article for(2)求证:△AOC≌△ABD;
ay use the contents or services of this article fo(3)当点C运动时,点P在y轴上的位置是否发生改变,为什么?
(第27题)
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参考答案
一、1.A 2.C 3.B 4.C 5.D 6.C 7.C 8.D 9.D
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