陕西省宝鸡市凤翔县2017-2018学年九年级（上）期末数学试卷

1.

下列各方程中，是一元二次方程的是（　　）

A．3x+2=3

B．x³+2x+1=0

C．x²=1

D．x²+2y=0

查看解析收藏

2.

若关于x的方程

有实数根，则实数k的取值范围是 (　　)

A．

B．

且

C．

D．

查看解析收藏

3.

如果两点P₁（1，y₁）和P₂（2，y₂）都在反比例函数y＝

的图象上，那么下列正确的是（）

A．y₂＜y₁＜0

B．y₁＜y₂＜0

C．y₂＞y₁＞0

D．y₁＞y₂＞0

查看解析收藏

4.

从长度分别为2，4，6，7的四条线段中随机取三条，能构成三角形的概率是（　　）

A．

B．

C．

D．

查看解析收藏

5.

下列立体图形中，主视图、左视图和俯视图都是矩形的是（　　）

A．

B．

C．

D．

查看解析收藏

6.

Lily's family

Lily is an American girl . She lives in Beijing with her parents and her brother.

Lily and her brother are students. They study in the same school. Lily is twelve years old. She likes making kites and playing the piano. Lily's brother is 10 years old. He likes playing football. They often goes hiking on the weekends.

Lily's father is tall and strong. He is a teacher. He teaches math in a high school. He often goes to work by bike. When it rains ,he drives to work. Lily's mother is very beautiful. She is a writer. She writes the TV show for the actors. She always stays at home because she only needs to write the TV show on the computer. Lily's grandparents are farmers. They live in a small village in America.They have a small farm. And they plant potatoes and many other vegetables on their farm.

Yesterday Lily's grandparents came to Beijing by plane. Lily and her brother met them at the airport. Then Lily and her grandparents climbed the Great Wall ,visited the Summer Palace and the Palace Museum together. They all enjoyed themselves.

根据短文内容判断正误。

查看解析收藏

7.

Lily's family

Lily is an American girl . She lives in Beijing with her parents and her brother.

Lily and her brother are students. They study in the same school. Lily is twelve years old. She likes making kites and playing the piano. Lily's brother is 10 years old. He likes playing football. They often goes hiking on the weekends.

Lily's father is tall and strong. He is a teacher. He teaches math in a high school. He often goes to work by bike. When it rains ,he drives to work. Lily's mother is very beautiful. She is a writer. She writes the TV show for the actors. She always stays at home because she only needs to write the TV show on the computer. Lily's grandparents are farmers. They live in a small village in America.They have a small farm. And they plant potatoes and many other vegetables on their farm.

Yesterday Lily's grandparents came to Beijing by plane. Lily and her brother met them at the airport. Then Lily and her grandparents climbed the Great Wall ,visited the Summer Palace and the Palace Museum together. They all enjoyed themselves.

根据短文内容判断正误。

查看解析收藏

8.

请从以下两个小题中任意选一题作答

A．如图，正方形CDEF内接于Rt△ABC，点	B．E、F分别在边A	C．AB和BC上，当AD=2，BF=3时正方形CDEF的面积是_____．
D．比较大小_____．（填“＞”“＜”或“=”）

查看解析收藏

9.

如图，点P在双曲线

（k≠0）上，点P′（1，2）与点P关于y轴对称，则此双曲线的解析式为．

查看解析收藏

10.

在如图所示的平面直角坐标系中，点P是直线y=x上的动点，A（2，0），B（6，0）是x轴上的两点，则PA+PB的最小值为_____．

查看解析收藏

11.

计算：
（1）

﹣2sin45°+（2﹣π）⁰﹣

tan30°
（2）2cos60°﹣（

）^﹣¹+tan 60⁰+|

﹣2|

查看解析收藏

12.

解方程：（1）4x²﹣8x+3=0；（2）x（x+6）=7

查看解析收藏

13.

如图是一个平均被分成6等分的圆，每一个扇形中都标有相应的数字，甲乙两人分别转动转盘，设甲转动转盘后指针所指区域内的数字为x，乙转动转盘后指针所指区域内的数字为y（当指针在边界上时，重转一次，直到指向一个区域为止）．
（1）直接写出甲转动转盘后所指区域内的数字为负数的概率；
（2）用树状图或列表法，求出点（x，y）落在第二象限内的概率．

查看解析收藏

14.

如图，在平面直角坐标系xOy中，直线y＝x+b与双曲线y＝

相交于A，B两点，
已知A（2，5）．求：
（1）b和k的值；
（2）△OAB的面积．

查看解析收藏

15.

如图，某足球运动员站在点O处练习射门，将足球从离地面0.5m的A处正对球门踢出(点A在y轴上)，足球的飞行高度y(单位：m)与飞行时间t(单位：s)之间满足函数关系y＝at²＋5t＋c，已知足球飞行0.8s时，离地面的高度为3.5m.
(1)足球飞行的时间是多少时，足球离地面最高？最大高度是多少？
(2)若足球飞行的水平距离x(单位：m)与飞行时间t(单位：s)之间具有函数关系x＝10t，已知球门的高度为2.44m，如果该运动员正对球门射门时，离球门的水平距离为28m，他能否将球直接射入球门？

查看解析收藏

陕西省宝鸡市凤翔县2017-2018学年九年级（上）期末数学试卷

1.单选题(共5题)

2.选择题(共2题)

3.填空题(共3题)

4.解答题(共5题)

【1】题量占比

【2】：难度分析