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已知过点A(1,3)和B(m,4)的直线与直线x+2y+1=0垂直,则m的值为(...
已知过点A(1,3)和B(m,4)的直线与直线x+2y+1=0垂直,则m的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257026996/SYS201310251240462570269006_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257026996/SYS201310251240462570269006_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257026996/SYS201310251240462570269006_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124046257026996/SYS201310251240462570269006_ST/3.png)
考点分析:
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