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\(c,\frac{x^2+\sqrt{3}}{x+\sqrt{x^2+\sqrt{3}}}+\frac{x^2-\sqrt{3}}{x+\sqrt{x^2+\sqrt{3}}}=x\)
\(\Rightarrow\frac{x^2}{x+\sqrt{x^2+\sqrt{3}}}=x\)
\(\Rightarrow2x^2=x^2+x\sqrt{x^2+\sqrt{3}}\)
\(\Rightarrow x^2=x\sqrt{x^2+\sqrt{3}}\)
\(\Rightarrow x^4=x^3+x\sqrt{3}\)
\(\Rightarrow x\left(x^2-x+\sqrt{3}\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x^2-x+\sqrt{3}=0\end{cases}}\)
\(\begin{array}{l} 2{x^2} - 11x + 21 - 3\sqrt[3]{{4x - 4}} = 0 \\ <=> 2{x^2} - 8x + 6 - 3x + 9 + 6 - 3\sqrt[3]{{4x - 4}} \\ <=> \left( {x - 3} \right)\left( {x - 1} \right) - 3\left( {x - 3} \right) - \frac{{108\left( {x - 3} \right)}}{{36 + 18\sqrt[3]{{4x - 4}} + 9\sqrt[3]{{{{\left( {4x - 4} \right)}^2}}}}} = 0 \\ <=> \left( {x - 3} \right)\left[ {x - 4 - \frac{{108}}{{36 + 18\sqrt[3]{{4x - 4}} + 9\sqrt[3]{{{{\left( {4x - 4} \right)}^2}}}}}} \right] = 0 \\ <=> x = 3 \\ \end{array} \)
_Học tốt_
\(\begin{array}{l} 2{x^2} - 11x + 21 - 3\sqrt[3]{{4x - 4}} = 0 \\ <=> 2{x^2} - 8x + 6 - 3x + 9 + 6 - 3\sqrt[3]{{4x - 4}} \\ <=> \left( {x - 3} \right)\left( {x - 1} \right) - 3\left( {x - 3} \right) - \frac{{108\left( {x - 3} \right)}}{{36 + 18\sqrt[3]{{4x - 4}} + 9\sqrt[3]{{{{\left( {4x - 4} \right)}^2}}}}} = 0 \\ <=> \left( {x - 3} \right)\left[ {x - 4 - \frac{{108}}{{36 + 18\sqrt[3]{{4x - 4}} + 9\sqrt[3]{{{{\left( {4x - 4} \right)}^2}}}}}} \right] = 0 \\ <=> x = 3 \\ \end{array}\)
\(a,\sqrt{x^2-4x+4}=\sqrt{4+2\sqrt{3}}\)
\(\Leftrightarrow\sqrt{\left(x-2\right)^2}=\sqrt{3+2\sqrt{3}+1}\)
\(\Leftrightarrow\sqrt{\left(x-2\right)^2}=\sqrt{\left(\sqrt{3}+1\right)^2}\)
\(\Leftrightarrow\left|x-2\right|=\sqrt{3}+1\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=\sqrt{3}+1\\2-x=\sqrt{3}+1\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\sqrt{3}+3\\x=1-\sqrt{3}\end{cases}}}\)
Vậy...
\(b,\sqrt{3x^2-4x}=2x-3.ĐKXĐ:x\le0,\frac{4}{3}\le x\)
\(\Leftrightarrow3x^2-4x=\left(2x-3\right)^2\)
\(\Leftrightarrow3x^2-4x=4x^2-12x+9\)
\(\Leftrightarrow4x^2-3x^2-12x+4x+9=0\)
\(\Leftrightarrow x^2-8x+9=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=4+\sqrt{7}\\x=4-\sqrt{7}\end{cases}}\)(t/m ĐKXĐ)
\(\sqrt{\left(x-2\right)^2}\)=\(|\sqrt{3}+1|\)
giải 2 th
phần b bình phương cả hai vế
\(VT=2\left(x^2-2.x.\frac{11}{4}+\frac{121}{16}\right)+\frac{47}{8}>0\)
=> \(VP>0\)=> x>1
pt <=> \(2\left(x^2-6x+9\right)=3\sqrt[3]{4x-4}-\left(x+3\right)\)
<=> \(2\left(x-3\right)^2=\frac{27\left(4x-4\right)-\left(x+3\right)^3}{9\sqrt[3]{\left(4x-4\right)^2}+3\left(x+3\right)\sqrt[3]{4x-4}+\left(x+3\right)^2}\)
<=> \(2\left(x-3\right)^2=\frac{-\left(x+15\right)\left(x-3\right)^2}{9\sqrt[3]{\left(4x-4\right)^2}+3\left(x+3\right)\sqrt[3]{4x-4}+\left(x+3\right)^2}\)
<=> \(\left(x-3\right)^2\left(2+\frac{x+15}{9\sqrt[3]{\left(4x-4\right)^2}+3\left(x+3\right)\sqrt[3]{4x-4}+\left(x+3\right)^2}\right)=0\)
x>1 => $\(2+\frac{x+15}{9\sqrt[3]{\left(4x-4\right)^2}+3\left(x+3\right)\sqrt[3]{4x-4}+\left(x+3\right)^2}>0\)
pT <=> \(\left(x-3\right)^2=0\)
<=> x=3
E cảm ơn