计算(
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+1)(2-
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)=
.
考点分析:
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已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154781767620/SYS201311011901547817676005_ST/0.png)
,若使y=k成立的x值恰好有三个,则k的值为( )
A.0
B.1
C.2
D.3
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如图,点A的坐标为(-1,0),点B在直线y=x上运动,当线段AB最短时,点B的坐标为( )
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A.(0,0)
B.(
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,-
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)
C.(-
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,-
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)
D.(-
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,-
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)
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如图,在矩形中截取两个相同的圆作为圆柱的上、下底面,剩余的矩形作为圆柱的侧面,刚好能组合成圆柱.设矩形的长和宽分别为y和x,则y与x的函数图象大致是( )
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A.
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B.
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C.
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D.
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一只盒子中有红球m个,白球8个,黑球n个,每个球除颜色外都相同,从中任取一个球,取得白球的概率与不是白球的概率相同,那么m与n的关系是( )
A.m=3,n=5
B.m=n=4
C.m+n=4
D.m+n=8
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下列方程中是关于x的一元二次方程的是( )
A.
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B.ax
2+bx+c=0
C.(x-1)(x+2)=1
D.3x
2-2xy-5y
2=0
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