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\(A=\dfrac{1}{\sqrt{1.1999}}+\dfrac{1}{\sqrt{2.1998}}+...+\dfrac{1}{\sqrt{1999.1}}>\dfrac{1}{\dfrac{1+1999}{2}}+\dfrac{1}{\dfrac{2+1998}{2}}+...+\dfrac{1}{\dfrac{1999+1}{2}}\)
\(=\dfrac{1}{1000}+\dfrac{1}{1000}+...+\dfrac{1}{1000}=1,999\)
Áp dụng bất đẳng thức Cô-si:
\(\frac{1}{\sqrt{1\cdot1999}}\ge\frac{1}{\frac{1+1999}{2}}=\frac{1}{1000}\)
Vì dấu "=" không xảy ra nên \(\frac{1}{\sqrt{1\cdot1999}}>\frac{1}{1000}\)
Tương tự ta có : \(\frac{1}{\sqrt{2\cdot1998}}>\frac{1}{1000};...;\frac{1}{\sqrt{1999\cdot1}}>\frac{1}{1000}\)
\(\Rightarrow\frac{1}{\sqrt{1\cdot1999}}+\frac{1}{\sqrt{2\cdot1998}}+...+\frac{1}{\sqrt{1999\cdot1}}>\frac{2000}{1000}=2>1,999\)
Vậy...
a) Ta có: \(P=\left(\dfrac{\sqrt{x}}{x\sqrt{x}-1}+\dfrac{1}{\sqrt{x}-1}\right):\dfrac{\sqrt{x}+1}{x+\sqrt{x}+1}\)
\(=\dfrac{\sqrt{x}+x+\sqrt{x}+1}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\cdot\dfrac{x+\sqrt{x}+1}{\sqrt{x}+1}\)
\(=\dfrac{\left(\sqrt{x}+1\right)^2}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}\)
\(=\dfrac{\sqrt{x}+1}{\sqrt{x}-1}\)
Ta có: \(A=\dfrac{1}{\sqrt{2}+1}+\dfrac{1}{\sqrt{3}+\sqrt{2}}+...+\dfrac{1}{\sqrt{120}+\sqrt{121}}\)
\(=-1+\sqrt{2}-\sqrt{2}+\sqrt{3}-...-\sqrt{120}+11\)
=10
Ta có: \(B=\dfrac{1}{\sqrt{1}}+\dfrac{1}{\sqrt{2}}+\dfrac{1}{\sqrt{3}}+...+\dfrac{1}{\sqrt{35}}\)
\(=\dfrac{2}{\sqrt{1}+\sqrt{1}}+\dfrac{2}{\sqrt{2}+\sqrt{2}}+...+\dfrac{2}{\sqrt{35}+\sqrt{35}}\)
\(\Leftrightarrow B< 2\left(\dfrac{1}{\sqrt{1}+\sqrt{2}}+\dfrac{1}{\sqrt{2}+\sqrt{3}}+...+\dfrac{1}{\sqrt{35}+\sqrt{36}}\right)\)
\(\Leftrightarrow B< 2\cdot\left(-\dfrac{1}{\sqrt{1}}+\dfrac{1}{\sqrt{2}}-\dfrac{1}{\sqrt{2}}+\dfrac{1}{\sqrt{3}}-...-\dfrac{1}{\sqrt{35}}+\dfrac{1}{\sqrt{36}}\right)\)
\(\Leftrightarrow B< 2\cdot\left(-\dfrac{1}{1}+\dfrac{1}{6}\right)\)
\(\Leftrightarrow B< -\dfrac{5}{3}< 10=A\)
Câu này dùng bất: \(\sqrt{ab}\le\dfrac{a+b}{2}\)
Áp dụng bài toán được:
\(A=\dfrac{1}{\sqrt{1.1999}}+\dfrac{1}{\sqrt{2.1998}}+...\dfrac{1}{\sqrt{1999.1}}\)
\(>\dfrac{1}{\dfrac{1+1999}{2}}+\dfrac{1}{\dfrac{2+1998}{2}}+...+\dfrac{1}{\dfrac{1999+1}{2}}\)
\(=\dfrac{1}{1000}+\dfrac{1}{1000}+...+\dfrac{1}{1000}\)
Làm nốt