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如图,正三棱锥O-ABC的底面边长为2,高为1,求该三棱锥的体积及表面积.
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围成的区域(含边界)为Ω
n(n=1,2,…),当点(x,y)分别在Ω
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M
n=( )
A.0
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C.2
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钱大姐常说“好货不便宜”,她这句话的意思是:“好货”是“不便宜”的( )
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设常数a∈R,集合A={x|(x-1)(x-a)≥0},B={x|x≥a-1},若A∪B=R,则a的取值范围为( )
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函数f(x)=x
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已知正方形ABCD的边长为1,记以A为起点,其余顶点为终点的向量分别为
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;以C为起点,其余顶点为终点的向量分别为
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,若i,j,k,l∈{1,2,3},且i≠j,k≠l,则
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的最小值是
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