已知△ABC的边长为a、b、c均为整数,且a、b满足
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510020_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510020_ST/1.png)
,求边长c的值.
考点分析:
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解下列方程:
(1)(x+2)
2-9=0;
(2)x(x-7)=8(7-x);
(3)2x
2+3x-1=0(公式法);
(4)x
2-2x-2=0(配方法).
查看答案
计算:(1)
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510018_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510018_ST/1.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510018_ST/2.png)
+|-2|;
(2)(3
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510018_ST/3.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510018_ST/4.png)
-4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510018_ST/5.png)
)÷
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510018_ST/6.png)
.
查看答案
下面是某同学在一次测验中解答的填空题:
①若x
2=m,则x=m;
②方程(2x-3)
2=3(2x-3)的解为x=3;
③若直角三角形有两边长分别为3和4,则第三边的长为5,
其中答案中完全正确的题目有( )
A.0个
B.1个
C.2个
D.3个
查看答案
如果关于x的一元二次方程x
2-2x+m=0有两个实数根,那么m的取值范围为( )
A.m<1
B.m>1
C.m≤1
D.m≥1
查看答案
若x=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510015_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510015_ST/1.png)
,y=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510015_ST/2.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510015_ST/3.png)
,则xy的值为( )
A.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510015_ST/4.png)
B.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510015_ST/5.png)
C.(a+b)
D.(a-b)
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