满分5 >
初中数学试题 >
已知二次函数:(1)图象不经过第三象限;(2)图象经过点(2,-5),请你写出一...
已知二次函数:(1)图象不经过第三象限;(2)图象经过点(2,-5),请你写出一个同时满足(1)和(2)的函数关系式: .
考点分析:
相关试题推荐
函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860012_ST/0.png)
中,自变量x的取值范围是
.
查看答案
在矩形ABCD中,AB=3,AD=4,P是AD上的动点,PE⊥AC于E,PF⊥BD于F,则PE+PF的值为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860011_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860011_ST/0.png)
B.2
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860011_ST/1.png)
D.1
查看答案
我们知道,溶液的酸碱度由PH确定.当PH>7时,溶液呈碱性;当PH<7时,溶液呈酸性.若将给定的HCl溶液加水稀释,那么在下列图象中,能反映HCl溶液的PH与所加水的体积(V)的变化关系的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860010_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860010_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860010_ST/images2.png)
D.
查看答案
如图是三个反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860009_ST/0.png)
,y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860009_ST/1.png)
,y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860009_ST/2.png)
在x轴上方的图象,由此观察得到k
1,k
2,k
3的大小关系为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860009_ST/images3.png)
A.k
1>k
2>k
3B.k
3>k
2>k
1C.k
2>k
3>k
1D.k
3>k
1>k
2
查看答案
已知实数x满足x
2+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860008_ST/0.png)
=0,那么x+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160539761386023/SYS201310221605397613860008_ST/1.png)
的值是( )
A.1或-2
B.-1或2
C.1
D.-2
查看答案