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满足|x|+|y|≤2的点(x,y)中整点(横纵坐标都是整数)有( ) A.9个...
满足|x|+|y|≤2的点(x,y)中整点(横纵坐标都是整数)有( )
A.9个
B.10个
C.13个
D.14个
考点分析:
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给出计算
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609007_ST/0.png)
的值的一个程序框图如图,其中判断框内应填入的条件是( )
A.i>10
B.i<10
C.i>20
D.i<20
查看答案
已知平面向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609006_ST/0.png)
=(1,2),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609006_ST/1.png)
=(-2,m),且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609006_ST/2.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609006_ST/3.png)
=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609006_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609006_ST/5.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609006_ST/6.png)
D.
查看答案
若x>0,y>0且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609005_ST/0.png)
,则xy有( )
A.最大值64
B.最小值
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609005_ST/1.png)
C.最小值
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101955580360911/SYS201311031019555803609005_ST/2.png)
D.最小值64
查看答案
下列说法不正确的是( )
A.空间中,一组对边平行且相等的四边形是一定是平行四边形
B.同一平面的两条垂线一定共面
C.过直线上一点可以作无数条直线与这条直线垂直,且这些直线都在同一个平面内
D.过一条直线有且只有一个平面与已知平面垂直
查看答案
与圆C:x
2+(y+5)
2=3相切、且纵截距和横截距相等的直线共有( )
A.2条
B.3条
C.4条
D.6条
查看答案