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由直线x=1,x=2,曲线y=x2及x轴所围图形的面积为( ) A.3 B.7 ...
由直线x=1,x=2,曲线y=x
2及x轴所围图形的面积为( )
A.3
B.7
C.
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230003197912863/SYS201311012300031979128002_ST/1.png)
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