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如图,P是反比例函数图象在第二象限上的一点,且矩形PEOF的面积为8,则反比例函...
如图,P是反比例函数图象在第二象限上的一点,且矩形PEOF的面积为8,则反比例函数的表达式是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108564444/SYS201311022359371085644004_ST/images0.png)
A.y=-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108564444/SYS201311022359371085644004_ST/0.png)
B.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108564444/SYS201311022359371085644004_ST/1.png)
C.y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108564444/SYS201311022359371085644004_ST/2.png)
D.y=-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108564444/SYS201311022359371085644004_ST/3.png)
考点分析:
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(k是常数,k>0,x>0)的图象上两点A,B分别作AC⊥x轴于C,BD⊥x轴于D,则△AOC的面积S
1和△BOD的面积S
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已知y=(m+1)x
m-2是反比例函数,则函数图象在( )
A.第一,三象限
B.第二,四象限
C.第一,二象限
D.第三,四象限
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反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108564444/SYS201311022359371085644001_ST/0.png)
的图象在每个象限内,y随x的增大而减小,则k的值可为( )
A.-1
B.0
C.1
D.2
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反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108564444/SYS201311022359371085644000_ST/0.png)
的图象在二,四象限,则k的取值范围是( )
A.k≤3
B.k≥-3
C.k>3
D.k<-3
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两个反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108360414/SYS201311022359371083604039_ST/0.png)
,y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108360414/SYS201311022359371083604039_ST/1.png)
在第一象限内的图象如图所示,点P
1,P
2,P
3,…,P
2005在反比例函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108360414/SYS201311022359371083604039_ST/2.png)
图象上,它们的横坐标分别是x
1,x
2,x
3,…,x
2005,纵坐标分别是1,3,5,…,共2005个连续奇数,过点P
1,P
2,P
3,…,P
2005分别作y轴的平行线,与y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131102235937108360414/SYS201311022359371083604039_ST/3.png)
的图象交点依次是Q
1(x
1,y
1),Q
2(x
2,y
2),Q
3(x
3,y
3),…,Q
2005(x
2005,y
2005),则y
2005=
.
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