ĐKXĐ: \(4\le x\le7\)
\(\sqrt{x+3}>\sqrt{7-x}+\sqrt{2x-8}\)
\(\Leftrightarrow x+3>x-1+2\sqrt{\left(7-x\right)\left(2x-8\right)}\)
\(\Leftrightarrow\sqrt{-2x^2+22x-56}< 2\)
\(\Leftrightarrow-x^2+11x-30< 0\)
\(\Rightarrow\left[{}\begin{matrix}x< 5\\x>6\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}4\le x< 5\\6< x\le7\end{matrix}\right.\)
Giải bất phương trình :
\(\sqrt{2^{x+1}}.\sqrt[3]{4^{2x-1}}.8^{3-x}>2\sqrt{2}.0,0125\)
\(\sqrt{x+8-2\sqrt{x+7}}=2-\sqrt{x+1-\sqrt{x+7}}\)
Giải bất phương trình sau:
1)\(\sqrt{2+x}+\sqrt{7-x}+\sqrt{-x^2+5x+14}< 3\)
2) \(x^2+2x+\sqrt{\left(x+3\right)\left(1-x\right)+5}>m\) khi m=2
\(\sqrt{2x+1}-\sqrt{x}=\sqrt{x-3}\)
Chứng minh các bất phương trình sau vô nghiệm :
a. \(x^2+\sqrt{x+8}\le-3\)
b. \(\sqrt{1+2\left(x-3\right)^2}+\sqrt{5-4x+x^2}< \dfrac{3}{2}\)
c. \(\sqrt{1+x^2}-\sqrt{7+x^2}>1\)
Giải bpt
\(\frac{x+2}{\sqrt{2x+3}-\sqrt{x+1}}\ge\sqrt{2x^2+5x+3}+1\)
Giải bất phương trình:
\(\sqrt{x+1}\)\(\leq\)\(\frac{^{x^2-x-2\sqrt[3]{2x+1}}}{\sqrt[3]{2x+1}-3}\)
Bài 1. Tìm điều kiện các BPT sau
a, \(\sqrt{20-x}>\sqrt{3x-6}+1\)
b, \(\frac{\sqrt{9-x^2}}{x-1}>\frac{1}{\sqrt{x}}+1\)
c, \(x+\frac{x+1}{\sqrt{x-4}}>2-\frac{2}{x^2-25}\)
d, \(\sqrt{x}>\sqrt{-x}\)
e, \(3x+\frac{4}{\sqrt{x-5}}\le9+\frac{x}{x-6}\)
f, \(\frac{x+2}{10+3x^2}\ge7+\frac{4}{\left(3x+9\right)^2}\)
g, \(\frac{\sqrt{x+2}}{\sqrt{x-2}}+\frac{1}{\left(x-4\right)\left(x+6\right)}\le\frac{3}{\sqrt{8-x}}\)
h, \(\frac{\sqrt{x+6}}{\left|x\right|-\sqrt{x+6}}\ge\sqrt{16-2x}\)
\(\sqrt{x^2+2x-7}\) +x2 +x-6 ≤ \(\sqrt{x-1}\)
