共50条信息
\(12.\)设函数\({f}_{1}(x)={x}^{2} \),\({f}_{2}(x)=2(x-{x}^{2}) {f}_{3}(x)= \dfrac{1}{3}|\sin 2πx| \),\({a}_{i}= \dfrac{i}{99},i=0,1,2,……99 \),记\({I}_{k}=|{f}_{k}({a}_{1})-{f}_{k}({a}_{0})|+|{f}_{k}({a}_{2})-{f}_{k}({a}_{1})|+……+|{f}_{k}({a}_{99})-{f}_{k}({a}_{98})| \),\(k=1,2,3 \)则\((\) \()\)
若\(a\)\(=0.3^{4}\),\(b\)\(=4^{0.3}\),\(c\)\(=\)\(\log \)\({\,\!}_{0.3}4\),则\(a\),\(b\),\(c\)的大小关系为______.
\(f(x)\)是定义在\((0,+∞)\)上的非负可导函数,且满足\(xf′(x)+f(x)\leqslant 0\),对任意正数\(a\),\(b\),若\(a < b\),则必有( )
已知定义在\(R\)上的函数\(y=f(x)\)满足:函数\(y=f(x-1)\)的图象关于直线\(x=1\)对称,且当\(x∈(-∞,0),f(x)+xf{{"}}(x) < 0 \)成立\(f{{"}}(x)\)是函数\(f(x)\)的导函数\()\),若\(a=(\sin \dfrac{1}{2})f(\sin \dfrac{1}{2}) \),\(b=(\ln 2)f(\ln 2)\),\(c=2f({\log }_{ \frac{1}{2}} \dfrac{1}{4}) \),则\(a\),\(b\),\(c\)的大小关系是\((\) \()\)
已知函数\(f(x)=\dfrac{x}{{{e}^{x}}}.\)
\((1)\)求函数\(y=f(x)\)在\(x=-1\)处的切线方程;
\((2)\)若对任意的\(x\in (0,2),\)都有\(f(x) < \dfrac{1}{k+2x-{{x}^{2}}}\)成立,求\(k\)的取值范围;
\((3)\)若函数\(h(x)=\ln f(x)+b\)的两个零点分别记为\({{x}_{1}},{{x}_{2}},\)试判断的大小,并证明你的结论.
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