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\(x\left(x^2+13x-6\right)=\left(x^2+8x-6\right)\sqrt{x^2+6x}\)
=> \(\left[x\left(x^2+13x+6\right)\right]^2=\left[\left(x^2+8x-6\right)\sqrt{x^2+6x}\right]^2\)
=> \(x^2\left(x^2+13x+6\right)^2=\left(x^2+8x-6\right)^2\left(x^2+6x\right)\)
<=> \(x^2\left(x^2+13x+6\right)-x\left(x+6\right)\left(x^2+8x-6\right)^2=0\)
<=> \(x\left(x^3+13x^2+6x-x^3-8x^2+6x-6x^2-48x+36\right)=0\)
<=> \(x\left(-x^2-36x+36\right)=0\)
\(\frac{2x}{x-2}-\frac{3x+10}{x^2-4}=\frac{x}{x+2}\left(x\ne\pm2\right)\)
\(\Leftrightarrow\frac{2x}{x-2}-\frac{3x+10}{\left(x-2\right)\left(x+2\right)}-\frac{x}{x+2}=0\)
\(\Leftrightarrow\frac{2x\left(x+2\right)}{\left(x-2\right)\left(x+2\right)}-\frac{3x+10}{\left(x-2\right)\left(x+2\right)}-\frac{x\left(x-2\right)}{\left(x-2\right)\left(x+2\right)}=0\)
\(\Leftrightarrow\frac{2x^2+4x}{\left(x-2\right)\left(x+2\right)}-\frac{3x+10}{\left(x-2\right)\left(x+2\right)}-\frac{x^2-2x}{\left(x-2\right)\left(x+2\right)}=0\)
\(\Leftrightarrow\frac{2x^2+4x-3x-10-x^2+2x}{\left(x-2\right)\left(x+2\right)}=0\)
\(\Leftrightarrow\frac{x^2+3x-10}{\left(x-2\right)\left(x+2\right)}=0\)
\(\Leftrightarrow\frac{x^2+5x-2x-10}{\left(x-2\right)\left(x+2\right)}=0\)
\(\Leftrightarrow\frac{\left(x+5\right)\left(x-2\right)}{\left(x-2\right)\left(x+2\right)}=0\)
=> x+5=0
<=> x=-5(tmđk)
Vậy x=-5 là nghiệm của phương trình
\(\frac{2x}{x-2}-\frac{3x+10}{x^2-4}=\frac{x}{x+2}\) ( đkxđ : \(x\ne\pm2\))
\(\Leftrightarrow\frac{2x}{x-2}-\frac{3x+10}{\left(x+2\right)\left(x-2\right)}=\frac{x}{x+2}\)
\(\Leftrightarrow\frac{2x\left(x+2\right)}{\left(x+2\right)\left(x-2\right)}-\frac{3x+10}{\left(x+2\right)\left(x-2\right)}=\frac{x\left(x-2\right)}{\left(x+2\right)\left(x-2\right)}\)
\(\Leftrightarrow2x^2+4x-3x-10=x^2-2x\)
\(\Leftrightarrow2x^2+4x-3x-10-x^2+2x=0\)
\(\Leftrightarrow x^2+3x-10=0\)
\(\Leftrightarrow\left(x+5\right)\left(x-2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x+5=0\\x-2=0\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=-5\\x=2\end{cases}}\)
\(x\ne\pm2\)=> x = -5
ĐK \(x\ne0\)
Chia cả 2 vế cho \(\frac{1}{x}\)ta được
\(\frac{3}{3x-4+\frac{1}{x}}+\frac{13}{3x+2+\frac{1}{x}}=6\)
Đặt \(3x+\frac{1}{x}=y\)
\(\Rightarrow\frac{3}{y-4}+\frac{13}{y+2}=6\)
\(\Leftrightarrow16y-46=6\left(y-4\right)\left(y+2\right)\)
Đến đây tự giải nhé (Phá ngoặc rồi ghép cặp lại)