共50条信息
设集合\(A=\{x|x^{2}+2x-3 < 0\}\),集合\(B=\{x||x+a| < 1\}\).
\((1)\)若\(a=3\),求\(A∪B\);
\((2)\)设命题\(p:x∈A\),命题\(q:x∈B\),若\(p\)是\(q\)的必要不充分条件,求实数\(a\)的取值范围.
已知集合\(A=\{x|{{x}^{2}}+2x-3=0\}\),\(B=\{-1,1\}\),则\(A∪B= \)
集合\(A=\{0,2,a\}\),\(B=\{1,a^{2}\}\),\(A∪B=\{0,1,2,4,16\}\),则\(a\)的值为\((\) \()\)
.已知全集\(U=\)\(R\),集合\(A=\)\(\{\)\(x|\)\(2\)\(x\)\({\,\!}^{2}\)\(-x-\)\(6\geqslant 0\}\),\(B=\)\(\left\{ \left.x \right| \dfrac{1-x}{x-3}\geqslant 0\right\} \),则\(A\)\(∪\)\(B=\) .
已知集合 \(A=\)\(\{ \)\(x|x > \)\(0\}\), \(B=\)\(\{ \)\(x|-\)\(1\leqslant \) \(x\)\(\leqslant 2\}\),则 \(A\)\(∪\)\(B=\) .
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