满分5 >
初中数学试题 >
用配方法将代数式a2+4a-5变形,结果正确的是( ) A.(a+2)2-1 B...
用配方法将代数式a2+4a-5变形,结果正确的是( )
A.(a+2)2-1
B.(a+2)2-5
C.(a+2)2+4
D.(a+2)2-9
考点分析:
相关试题推荐
如图,直线AB与半径为2的⊙O相切于点C,D是⊙O上一点,且∠EDC=30°,弦EF∥AB,则EF的长度为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171007_ST/images0.png)
A.2
B.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171007_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171007_ST/1.png)
D.2
查看答案
一件标价为600元的上衣,按8折销售仍可获利20元,设这件上衣的成本价为x元,根据题意,下面所列的方程正确的是( )
A.600×0.8-x=20
B.600×8-x=20
C.600×0.8=x-20
D.600×8=x-20
查看答案
如图,反比例函数y=-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171005_ST/0.png)
的图象与直线y=-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171005_ST/1.png)
x的交点为A,B,过点A作y轴的平行线与过点B作x轴的平行线相交于点C,则△ABC的面积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171005_ST/images2.png)
A.8
B.6
C.4
D.2
查看答案
点(1,3)关于x轴对称点的坐标是( )
A.(-1,3)
B.(-1,-3)
C.(1,-3)
D.(3,1)
查看答案
如图是空心圆柱体,下面的四幅图是在指定方向上的视图,其中正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171003_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101194022907117181/SYS201311011940229071171003_ST/images3.png)
D.
查看答案