共50条信息
设集合\(A=\left\{(x,y){ \left|(x-3) \right.}^{2}+(y-4{)}^{2}= \dfrac{4}{5}\right\} \),\(B=\left\{(x,y){ \left|(x-3) \right.}^{2}+(y-4{)}^{2}= \dfrac{36}{5}\right\} \),\(C=\{(x,y)|2|x-3|+|y-4|=λ\}\),若\((A∪B)∩C\neq \varnothing \),则实数\(λ\)的取值范围是
设\(A\),\(B\)是非空集合,定义\(A\)\(⊗\)\(B\)\(=\{\)\(x\)\(|\)\(x\)\(∈(\)\(A\)\(∪\)\(B\)\()\)且\(x\)\(∉(\)\(A\)\(∩\)\(B\)\().\)已知集合\(A\)\(=\{\)\(x\)\(|0 < \)\(x\)\( < 2\}\),\(B\)\(=\{\)\(y\)\(|\)\(y\)\(\geqslant 0\}\),则\(A\)\(⊗\)\(B\)\(=\)________.
已知全集\(U=R\),集合\(A=\{x|x^{2}-5x+4 < 0\}\),\(B=\{x|x\leqslant 3m-4\)或\(x\geqslant 8+m\}(m < 6)\).
\((1)\)若\(m=2\),求\(A\bigcap ({{\complement }_{U}}B)\);
\((2)\)若\(A\bigcap ({{\complement }_{U}}B)=\varnothing \),求实数\(m\)的取值范围.
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