共50条信息
\(17.\)已知集合.
\((1)\)求;
\((2)\)
\((1)\)若\(B=R\),求\(k\)的取值范围;
\((2)\)若\(({{\complement }_{R}}A)\bigcap B=B\),\(({{\complement }_{R}}A)\bigcup B=\{x|-2\leqslant x\leqslant 3\}\),求实数\(a\),\(b\)的值及实数\(k\)的取值范围.
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.
设全集是实数集\(R\),集合 \(A=\)\(\{ \)\(x|y=\)\(\log \) \({\,\!}_{a}\)\(( \)\(x-\)\(1)\) \(+\)\( \sqrt{3-x} \}\), \(B=\)\(\{ \)\(x|\)\(2\) \({\,\!}^{x}+m\)\(\leqslant 0\}\) .
\((1)\)当\(m=-\)\(4\)时,求\(A\)\(∩\)\(B\)和\(A\)\(∪\)\(B\)\(;\)
\((2)\)若\((∁_{R}\)\(A\)\()∩\)\(B=B\),求实数\(m\)的取值范围.
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