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一布袋中有红球8个,白球12个和黄球5个,它们除了颜色外没有其它区别,闭上眼睛,...
一布袋中有红球8个,白球12个和黄球5个,它们除了颜色外没有其它区别,闭上眼睛,随机从袋中取出1球不是黄球的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460003_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460003_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460003_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460003_ST/3.png)
考点分析:
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如图,△ABC中,∠C=90°,AB=5,AC=3,则sinB=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460002_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460002_ST/0.png)
B.
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C.
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D.
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方程x
2=3的解是( )
A.±3
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460001_ST/0.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460001_ST/1.png)
D.
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下列计算正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460000_ST/0.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460000_ST/1.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460000_ST/2.png)
B.
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-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460000_ST/4.png)
=0
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308953146013/SYS201311030013089531460000_ST/5.png)
•
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=9
D.
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创新题:
如图所示,甲、乙两人开车分别从正方形广场ABCD的顶点B、C两点同时出发,甲由C向D运动,乙由B向C运动,甲的速度为1km/min,乙的速度为2km/min;若正方形广场的周长为40km,问几分钟后,两人相距2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510024_ST/0.png)
km?
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探索题:
观察下列格式
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103001308952951014/SYS201311030013089529510023_ST/0.png)
=
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-1,
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=
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-
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,=-
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…请你从上述等式中找出规律,并利用这一规律计算(
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+
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+…+
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)(
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)的值.
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