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如图,在6×11的正方形网格中有一只可爱的小狐狸,算算看画面中由实线组成的相似三...
如图,在6×11的正方形网格中有一只可爱的小狐狸,算算看画面中由实线组成的相似三角形有( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102555423507784/SYS201311031025554235077001_ST/images0.png)
A.4对
B.3对
C.2对
D.1对
考点分析:
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考虑下面4个命题:①有一个角是100°的两个等腰三角形相似;②斜边和周长对应相等的两个直角三角形全等;③对角线互相垂直且相等的四边形是正方形;④对角线相等的梯形是等腰梯形.其中正确命题的序号是( )
A.①②③④
B.①③④
C.①②④
D.②③④
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如图,点A,B分别在射线OM,ON上,C,D分别是线段OA和OB上的点,以OC,OD为邻边作平行四边形OCED,下面给出三种作法的条件:①取OC=
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OA,OD=
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OB;②取OC=
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OA,OD=
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OB;③取OC=
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OA,OD=
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OB.能使点E落在阴影区域内的作法有( )
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A.①
B.①②
C.①②③
D.②③
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如图,在平行四边形ABCD中,E为AD的中点,△DEF的面积为1,则△BCF的面积为( )
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A.1
B.2
C.3
D.4
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在△ABC中,BC=10,B
1、C
1分别是图①中AB、AC的中点,在图②中,B
1,B
2,C
1,C
2分别是AB,AC的三等分点,在图③中B
1,B
2…B
9;C
1,C
2…C
9分别是AB、AC的10等分点,B
1C
1+B
2C
2+…+B
9C
9的值是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102555423507784/SYS201311031025554235077021_ST/images0.png)
A.30
B.45
C.55
D.60
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如图,在平行四边形ABCD中,E是AB的中点,CE和BD交于点O,设△OCD的面积为m,△OEB的面积为
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,则下列结论中正确的是( )
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A.m=5
B.m=4
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C.m=3
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D.m=10
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