满分5 >
初中数学试题 >
方程(x+4)(x-5)=1的根为( ) A.x=-4 B.x=5 C.x1=-...
方程(x+4)(x-5)=1的根为( )
A.x=-4
B.x=5
C.x1=-4,x2=5
D.以上结论都不对
考点分析:
相关试题推荐
要用配方法解一元二次方程x
2-4x-3=0,那么下列变形的结果中正确的是( )
A.x
2-4x+4=9
B.x
2-4x+4=7
C.x
2-4x+16=19
D.x
2-4x+2=5
查看答案
观察下列等式:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100047237333676/SYS201311031000472373336010_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100047237333676/SYS201311031000472373336010_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100047237333676/SYS201311031000472373336010_ST/2.png)
,…请你从上述等式中找出规律,并利用这一规律计算:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103100047237333676/SYS201311031000472373336010_ST/3.png)
=
.
查看答案