共50条信息
已知\(x\),\(y∈R^{+}\),且\(2x+3y=1\),则\(\dfrac{1}{x}+ \dfrac{1}{y} \)的最小值是________.
已知函数\(f(x)=|3x+2|\)
\((1)\)解不等式\(f(x) < 4-\left| x-1 \right|\),
\((2)\)已知\(m+n=1(m,n > 0)\),若\(|x-a|-f(x)\leqslant \dfrac{1}{m}+\dfrac{1}{n}(a > 0)\)恒成立,求实数\(a\)的取值范围.
\((1)\)设\(a > 0\),\(b > 0\),\(a+b=1\),求证:\(\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{ab}\geqslant 8\).
\((2)\)若\(a\),\(b\),\(c\)是不全相等的正实数,求证:\(\dfrac{b+c-a}{a}+\dfrac{a+c-b}{b}+\dfrac{a+b-c}{c} > 3\).
在\(\triangle ABC\)中,角\(A\),\(B\),\(C\)的对边分别为\(a\),\(b\),\(c\),若\(b\cos C-(2a-c)\sin (B+ \dfrac{π}{2})=0 \),且\(b= \sqrt{3} \),记\(h\)为\(AC\)边上的高,则\(h\)的取值范围为_____.
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