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小明正在玩飞镖游戏,如果小明将飞镖随意投中如图所示的正方体木框中,那么投中阴影部...
小明正在玩飞镖游戏,如果小明将飞镖随意投中如图所示的正方体木框中,那么投中阴影部分的概率为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164720062144619/SYS201310221647200621446004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164720062144619/SYS201310221647200621446004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164720062144619/SYS201310221647200621446004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164720062144619/SYS201310221647200621446004_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164720062144619/SYS201310221647200621446004_ST/3.png)
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如图,量角器外缘上有A,B两点,它们所表示的读数分别是80°、50°,则∠ACB应为( )
A.25°
B.15°
C.30°
D.50°
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如图,由几个相同的小正方体搭成一个几何体,它的俯视图是( )
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A.
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B.
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C.
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D.
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下列计算正确的是( )
A.a
3+a
2=2a
5B.(-2a
3)
2=4a
6C.a
2•a
3=a
6D.a
6÷a
2=a
3
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-2的倒数是( )
A.2
B.-2
C.
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D.
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在平面直角坐标系中,已知等腰梯形ABCD的三个顶点A(-2,0),B(6,0),C(4,6),对角线AC与BD相交于点E.
(1)求E的坐标;
(2)若M是x轴上一动点,求MC+MD的最小值;
(3)在y轴正半轴上求点P,使以P、B、C为顶点的三角形为等腰三角形.
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