全一卷
1.
的值等于( )
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A.2 | B.![]() | C.![]() | D.﹣2 |
2.计算
的结果是( )
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A.1 | B.![]() | C.2 | D.4 |
3.下列图形中具有稳定性的是( )
A.三角形 | B.平行四边形 | C.长方形 | D.正方形 |
4.如图,直线a,b被直线c所截,a∥b,∠1=40°,则∠2等于( )
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A.30° | B.40° | C.50° | D.60° |
5.如图,在
中,
,点D,E分别为
,
的中点,则
( )
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A.![]() | B.![]() | C.1 | D.2 |
6.在平面直角坐标系中,将点
向右平移2个单位后,得到的点的坐标是( )
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A.![]() | B.![]() | C.![]() | D.![]() |
7.书架上有2本数学书、1本物理书.从中任取1本书是物理书的概率为( )
A.![]() | B.![]() | C.![]() | D.![]() |
8.如图,在
中,一定正确的是( )
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A.![]() | B.![]() | C.![]() | D.![]() |
9.点
,
,
,
在反比例函数
图象上,则
,
,
,
中最小的是( )
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A.![]() | B.![]() | C.![]() | D.![]() |
10.水中涟漪(圆形水波)不断扩大,记它的半径为r,则圆周长C与r的关系式为
.下列判断正确的是( )
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A.2是变量 | B.![]() | C.r是变量 | D.C是常量 |
11.sin30°的值为_____ .
12.单项式
的系数为___________ .
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13.菱形的边长为5,则它的周长为____________ .
14.若
是方程
的根,则
____________ .
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15.扇形的半径为2,圆心角为90°,则该扇形的面积(结果保留
)为____________ .
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16.解不等式组:
.
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17.先化简,再求值:
,其中
.
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18.如图,已知
,点P在
上,
,
,垂足分别为D,E.求证:
.
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19.《九章算术》是我国古代的数学专著,几名学生要凑钱购买1本.若每人出8元,则多了3元;若每人出7元,则少了4元.问学生人数和该书单价各是多少?
20.物理实验证实:在弹性限度内,某弹簧长度y(
)与所挂物体质量x(
)满足函数关系
.下表是测量物体质量时,该弹簧长度与所挂物体质量的数量关系.
(1)求y与x的函数关系式;
(2)当弹簧长度为20
时,求所挂物体的质量.
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x | 0 | 2 | 5 |
y | 15 | 19 | 25 |
(2)当弹簧长度为20
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21.为振兴乡村经济,在农产品网络销售中实行目标管理,根据目标完成的情况对销售员给予适当的奖励,某村委会统计了15名销售员在某月的销售额(单位:万元),数据如下:10,4,7,5,4,10,5,4,4,18,8,3,5,10,8
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(1)补全月销售额数据的条形统计图.
(2)月销售额在哪个值的人数最多(众数)?中间的月销售额(中位数)是多少?平均月销售额(平均数)是多少?
(3)根据(2)中的结果,确定一个较高的销售目标给予奖励,你认为月销售额定为多少合适?
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(1)补全月销售额数据的条形统计图.
(2)月销售额在哪个值的人数最多(众数)?中间的月销售额(中位数)是多少?平均月销售额(平均数)是多少?
(3)根据(2)中的结果,确定一个较高的销售目标给予奖励,你认为月销售额定为多少合适?
22.如图,四边形
内接于
,
为
的直径,
.
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(1)试判断
的形状,并给出证明;
(2)若
,
,求
的长度.
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(1)试判断
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(2)若
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23.如图,抛物线
(b,c是常数)的顶点为C,与x轴交于A,B两点,
,
,点P为线段
上的动点,过P作
//
交
于点Q.
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(1)求该抛物线的解析式;
(2)求
面积的最大值,并求此时P点坐标.
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(1)求该抛物线的解析式;
(2)求
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