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设a=x1+x2,b=x1•x2,那么|x1-x2|可以表示为( ) A. B....
设a=x
1+x
2,b=x
1•x
2,那么|x
1-x
2|可以表示为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807623276/SYS201311011934298076232005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807623276/SYS201311011934298076232005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807623276/SYS201311011934298076232005_ST/2.png)
D.±
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193429807623276/SYS201311011934298076232005_ST/3.png)
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