共50条信息
已知函数\(f(x)=|2x-4|+|x+1|\).
\((\)Ⅰ\()\)解不等式\(f(x)\leqslant 9\);
\((\)Ⅱ\()\)若不等式\(f(x) < 2x+a\)的解集为\(A\),\(B=\{x|x²-3x < 0\}\),且满足\(B⊑A \),求实数\(a\)的取值范围.
若\(A{=}\{ x{|}ax^{2}{-}{ax}{+}1{\leqslant }0{,}x{∈}R\}{=⌀}\),则\(a\)的取值范围是______.
已知集合\(A\)\(=\{\)\(x\)\(||\)\(x\)\(-1|\leqslant \)\(a\),\(a\)\( > 0)\),\(B\)\(=\{\)\(x\)\(|\)\(x\)\({\,\!}^{2}-6\)\(x\)\(-7 > 0)\),且\(A\bigcap B=\varnothing \),则\(a\)的取值范围是________.
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