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1、永乐中学 20172018 学年度第一学期月考试卷九年级数学班级:考号:姓名:得分:一、选择题(每题 4 分,共 40 分)1下列方程是一元二次方程是()Ay=2x+3 By=(x-2)(x-3)Cy=x2-x(x-3)Dy=x2+x12把二次函数122xxy配方成顶点式为()A2)1(xyB2)1(2xyC1)1(2xyD2)1(2xy3直角坐标平面上将二次函数y-2(x1)22 的图象向左平移个单位,再向上平移个单位,则其顶点为()A(0,0)B(1,2)C(0,1)D(2,1)4 函数 y=ax2+bx+c 的图象如图所示,那么关于一元二次方程ax2+bx+c=0的根的情况()A有两个不
2、相等的实数根 B有两个异号的实数根C有两个相等的实数根 D没有实数根5二次函数cbxaxy2的图象如右图所示,则abc 0,acb42 0,ba2 0 这四个式子中,值为正数的有()A4 个B3 个C 2 个D1 个6若方程013)2(|mxxmm是关于 x 的一元二次方程,则()A2mBm=2 Cm=2 D2m有两个相等的实数根,则等7 一元二次方程于()A.B.1 C.2 D.或 1 8某种商品零售价经过两次降价后的价格为降价前的,则平均每次降价()A B C D m660624)2(2mmxxm9白云航空公司有若干个飞机场,每两个飞机场之间都开辟一条航线,一共开辟了10条航线,则这个航空
3、公司共有飞机场()A4 个B5 个C6 个D7 个10 已知抛物线2yaxxc如图所示,方程a+bx+c=0的解为()Ax=4 B x1=1,x2=4 Cx=1 Dx1=-2,x2=4 二、填空题(每题 4 分,共 40 分)11已知关于x的一元二次方程22340 xkx的一个根是1,则 k=.12.已知一个一元二次方程的两根分别为x1=-2,x2=3,这个方程是 _ _13 若|b1|+=0,且一元二次方程k+ax+b=0有实数 根,则 k的取值范围是 .14.已知12xx,是一元二次方程122xx的两个根,则2111xx的值为。15.代数式x2-2x-4 有最(填大或小)值,是.16已知抛
4、物线342xxy,请回答以下问题:它的开口向,对称轴是直线,顶点坐标为图象与x轴的交点为,与y轴的交点为17抛物线y=x2+2x-3在x轴上截得的线段长度是18一个二次函数的图象顶点坐标为(2,1),形状与抛物线22yx相同,这个函数解析式为 _19二次函数22yxx,当 x _ 时,y 随 x 增大而增大,当x _时,y 随 x增大而减小20如右图是2yaxbxc的图象,则(填“”,“”或“=”)a_ 0,b_ 0,c_ 0,a+b+c _ 0,a-b+c _0,b2-4ac_ 0,2a+b _0三、简答题20、用适当的方法解下列方程:(每题 6分,共 12 分)(1)8)6)(3(xx(2
5、)1632xx;文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8
6、T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码
7、:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9
8、W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G
9、2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P
10、8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V
11、10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T521.(9 分)关于x的方程04)2(2kxkkx有两个不相等的实数根.求k的取值范围.22.(9 分)已知 m、n 是方程-2x2+3x-1=0的两根
12、,求代数式 m2+n2的值。23.(12 分)某商人如果将进货价为8 元的商品按每件10 元出售,每天可销售100 件,现采用提高售出价,减少进货量的办法增加利润,已知这种商品每涨价1 元其销售量就要减少10件,问他将售出价定为多少元时,才能使每天所赚的利润最大?并求出最大利润文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V
13、1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T
14、5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:
15、CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W
16、10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2
17、 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8
18、G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V1
19、0 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5ABCQP4 3 2 1-1-2-1 1A 2 3 4 C O x y B D 24、(14 分)抛物线cbxaxy2与 x轴相交于两点A(1,0),B(3,0),与 y 轴相交于点 C(0,3)(1)求抛物线的函数关系式;(2)若点 D(27,m)是抛物线cbxaxy2上的一点,请求出m的值,并求出此时 ABD的面积25(14 分)如图,在 ABC 中,B=90,AB=6cm,BC=8cm,若 P点沿 AB向 B以 1cm s 的速度移动,点 Q从 B沿 BC向 C以 2cm s 的
20、速度移动。(1)几秒后,PBQ 的面积为 8cm2?(2)几秒后,四边形APQC 面积达到最小?最小面积是多少?文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8
21、V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8
22、T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码
23、:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9
24、W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G
25、2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5文档编码:CM1L9W10V7G2 HB6P8G3Q3V10 ZK8V1Y9L8T5