共50条信息
已知\(f\left( \left. x+ \dfrac{1}{x} \right. \right)=x^{2}+ \dfrac{1}{x^{2}}\),则\(f(x)\)的解析式为________.
已知函数\(f(x)\),\(g(x)\)的部分自变量与对应的函数值如下表所示:
\(x\)
\(1\)
\(2\)
\(3\)
\(f(x)\)
\(4\)
\(g(x)\)
\(-1\)
求\(f[g(2)]\)和\(g[f(2)]\)的值.
设函数\(f(x)\)的定义域为\(D\),\(D⊆[0,4π] \),它的对应法则\(f\):\(x→\sin x \),现已知\(f(x)\)的值域是\(\left\{0,- \dfrac{1}{2},1\right\} \),则这样的函数有________________个.
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