共50条信息
若实数\(x+y+z=1\),则\(2x^{2}+y^{2}+3z^{2}\) 的最小值为\((\) \()\)
已知\(a{,}b{,}c{∈}(0{,}1)\),且\({ab}{+}{bc}{+}{ac}{=}1\),则\(\dfrac{1}{1{-}a}{+}\dfrac{1}{1{-}b}{+}\dfrac{1}{1{-}c}\)的最小值为\(({ })\)
已知\(x\),\(y\),\(z∈R\),且\(\dfrac{1}{x}+\dfrac{2}{y}+\dfrac{3}{z}=1\),则\(x+\dfrac{y}{2}+\dfrac{z}{3}\)的最小值是\((\) \()\)
已知\(x+y=1\),则\(2{{x}^{2}}+3{{y}^{2}}\)的最小值是\((\) \()\)
设\(x > y > z > 0\),若\(\dfrac{1}{x-y}+\dfrac{1}{y-z}+\dfrac{\lambda }{z-x}\geqslant 0\)恒成立,则\(λ\)的最大值是\((\) \()\)
设\(a_{1}\),\(a_{2}\),\(…\),\(a_{n}∈R\),\(n∈N^{*}\)且\(n\geqslant 3.\)若\(p\):\(a_{1}\),\(a_{2}\),\(…\),\(a_{n}\)成等比数列;\(q\):\((a_{1}^{2}+a_{2}^{2}+…+a_{n-1}^{2})(a_{2}^{2}+a_{3}^{2}+…+a_{n}^{2})=(a_{1}a_{2}+a_{2}a_{3}+…+a_{n-1}a_{n})^{2}\),则\((\) \()\)
若实数\(x\),\(y\),\(z\)满足\({x}^{2}+{y}^{2}+{z}^{2}=9 \),则\(x+2y+3z \)的最大值是 \((\) \()\)
设\(c_{1}\),\(c_{2}\),\(…\),\(c_{n}\)是\(a_{1}\),\(a_{2}\),\(…\),\(a_{n}\)的某一排列\((a_{1},a_{2},…,a_{n}\)均为正数\()\),则\( \dfrac{a_{1}}{c_{1}}+ \dfrac{a_{2}}{c_{2}}+…+ \dfrac{a_{n}}{c_{n}}\)的最小值是
进入组卷