共50条信息
已知集合\(A=\left\{ x|{{x}^{2}}-4x-5\geqslant 0 \right\}\),集合\(B=\left\{ x|2a\leqslant x\leqslant a+2 \right\}\).
\((1)\)若\(a=-1\),求\(A\bigcap B\)和\(A\bigcup B\);
\((2)\)若\(A\bigcap B=B\),求实数\(a\)的取值范围.
已知集合\(A=\left\{ x\left| \dfrac{(x-1)(x-4)}{x-2} \right.\leqslant {0} \right\}\),\(B=\left\{ x\in N\left| -1\leqslant x\leqslant 5 \right. \right\}\),则集合\(A\bigcap B\)的子集个数为\((\) \()\)
设集合\(M=\{-1,1\}\),\(N=\left\{ \left.x \right| \dfrac{1}{x} < 2\right\} \),则下列结论中正确的是 \((\) \()\)
已知集合 \(A\)\(=\{ \)\(x\)\(|2\) \(a\)\(-2 < \) \(x\)\( < \) \(a\)\(\}\), \(B\)\(=\{ \)\(x\)\(|1 < \) \(x\)\( < 2\}\),且 \(A⊆ \)\(∁_{R}\) \(B\),求 \(a\)的取值范围.
已知集合\(A=\{x|y=\lg (x-x^{2})\}\),集合\(B=\{x|x^{2}-cx < 0(c > 0)\}\),若\(A⊆B\),则\(c\)的取值范围为
已知集合\(A=\left\{ 0,1,2 \right\}\),则集合\(B=\left\{x-y|x∈A,y∈A\right\} \)的真子集个数是
设全集\(U=R\),集合\(A=\left\{ x|-1\leqslant x < 3 \right\}\),\(B=\left\{ x|2x-4\geqslant x-2 \right\}\)
\((1)\)求\({{C}_{U}}(A\bigcap B)\);
\((2)\)若集合\(C=\{x|2x+a > 0\}\),满足\(B\bigcup C=C\),求实数\(a\)的取值范围.
进入组卷