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在平面直角坐标系中,横坐标与纵坐标都在集合A={0,1,2,3,4,5}内取值的...
在平面直角坐标系中,横坐标与纵坐标都在集合A={0,1,2,3,4,5}内取值的点中任取一个点,此点正好在直线y=x上的概率为 .
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假设关于某设备的使用年限x和所支出的维修费用y(万元),有如下的统计资料:
使用年限x | 2 | 3 | 4 | 5 | 6 |
维修费用y | 2.2 | 3.8 | 5.5 | 6.5 | 7.0 |
由资料知y与x呈线性相关关系.(参考数据
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=90,
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=112.3)
估计当使用年限为10年时,维修费用是
万元.
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线性回归方程:y=
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x+
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.
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已知|
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|=|
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|=2,
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与
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的夹角为
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,则
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+
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在
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上的投影为
.
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函数y=sinx-cosx的图象可以看成是由函数y=sinx+cosx的图象向右平移得到的,则平移的最小长度为
.
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若
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,且
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已知点(x,y)可在x
2+y
2<4表示的区域中随机取值,记点(x,y)满足|x|>1为事件A,则P(A)等于( )
A.
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B.
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C.
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D.
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