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若3x=4,9y=7,则3x-2y的值为( ) A. B. C.-3 D.
若3
x=4,9
y=7,则3
x-2y的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192408564720835/SYS201311011924085647208008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192408564720835/SYS201311011924085647208008_ST/1.png)
C.-3
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101192408564720835/SYS201311011924085647208008_ST/2.png)
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