共50条信息
已知集合\(A=\left\{ 1,2,4 \right\},B=\left\{ 2,4 \right\}\),则集合\(A\bigcup B=\) ;
已知集合\(A{=}\{ x{|}x^{2}{ > }2x\}{,}B{=}\{ x{|-}1{ < }x{\leqslant }2\}\),则\(({ })\)
已知集合\(A\left(x|x < 1\right) \),\(B=\left\{x|{3}^{x} < 1\right\} \),则\((\) \()\)
已知集合\(A=\left\{ x{ }\!\!|\!\!{ }x < 1 \right\}\),\(B=\left\{ x{ }\!\!|\!\!{ }3-2x > 0 \right\}\),则\((\) \()\)
设集合\(A=\{1,2,6\},B=\{2,4\},C=\{x\in R|-1\leqslant x\leqslant 5\}\),则\((A\bigcup B)\bigcap C=\)
若集合\(A=\left\{x|-1 < x < 1,x∈R\right\},B=\left\{x|y= \sqrt{x-2},x∈R\right\} \),则\(A∪B= \) \((\) \()\)
已知集合\(A=(-2,1] ,B=[-1,2) \),则\(A∪B= \)______.
若\(A=\{2,3,4\}\),\(B=\{3,4,5\}\),则集合\(A\bigcup B\)中的元素个数是\((\) \()\)
设集合\(A=\{1,2,3\}\),\(B=\left\{ x\in R\left| {{x}^{2}}-x=0 \right. \right\}\),则\(A\bigcup B=\)
设集合\(A=\left\{ x|-1 < x\leqslant 2 \right\}\),\(B=\left\{ x|x < 0 \right\}\),则\(A∪B= \)
进入组卷