Có (x+1)/(x-2)+x/(x+2)=(6-x)/(x^2-4)+1

<=>(x+1)(x+2)/(x-2)(x+2)+x(x-2)/(x-2)(x+2)=(6-x)/(x-2)(x+2)+(x-2)(x+2)/(x-2)(x+2)

=>(x+1)(x+2)+x(x-2)=(6-x)+(x-2)(x+2)

<=>x^2+3x+2+x^2-2x=6-x+x^2-4

<=>2x^2+x+2=x^2-x+2

<=>x^2+2x=0

<=>x(x+2)=0

suy ra :x=0 hoặc x=-2

Vậy...

\(ĐKXĐ:x\ne\pm1\)

\(pt\Leftrightarrow\frac{\left(x+1\right)\left(x^2+x+1\right)-3x^2\left(x^2+x+1\right)}{\left(x-1\right)\left(x+1\right)\left(x^2+x+1\right)}\)\(=\frac{2x\left(x+1\right)\left(x-1\right)}{\left(x-1\right)\left(x+1\right)\left(x^2+x+1\right)}\)

\(\Leftrightarrow\left(x+1\right)\left(x^2+x+1\right)-3x^2\left(x^2+x+1\right)\)\(=2x\left(x+1\right)\left(x-1\right)\)

\(\Leftrightarrow\left(x+1-3x^2\right)\left(x^2+x+1\right)\)\(=2x\left(x^2-1\right)\)

\(\Leftrightarrow-3x^4-2x^3-x^2+2x+1\)\(=2x^3-2x\)

\(\Leftrightarrow-3x^4-4x^3-x^2+4x+1=0\)

\(\frac{x-1}{x+3}-\frac{x}{x-3}=\frac{7x-3}{9-x^2}\)ĐK : \(x\ne\pm3\)

\(\Leftrightarrow\frac{x-1}{x+3}+\frac{x}{3-x}=\frac{7x-3}{9-x^2}\)

\(\Leftrightarrow\frac{\left(x-1\right)\left(3-x\right)+x\left(x+3\right)}{\left(x+3\right)\left(3-x\right)}=\frac{7x-3}{\left(3-x\right)\left(x+3\right)}\)

\(\Rightarrow3x-x^2-3+x+x^2+3x=7x-3\)

\(\Leftrightarrow7x-3=7x-3\Leftrightarrow0x=0\)

Vậy phương trình có vô số nghiệm 

Trả lời:

\(\frac{x-1}{x+3}-\frac{x}{x-3}=\frac{7x-3}{9-x^2}\)\(\left(ĐKXĐ:x\ne\pm3\right)\)

\(\Leftrightarrow\frac{x-1}{x+3}-\frac{x}{x-3}=\frac{3-7x}{x^2-9}\)

\(\Leftrightarrow\frac{\left(x-1\right)\left(x-3\right)}{x^2-9}-\frac{x\left(x+3\right)}{x^2-9}=\frac{3-7x}{x^2-9}\)

\(\Rightarrow x^2-3x-x+3-\left(x^2+3x\right)=3-7x\)

\(\Leftrightarrow x^2-4x+3-x^2-3x=3-7x\)

\(\Leftrightarrow3-7x=3-7x\)

\(\Leftrightarrow-7x+7x=3-3\)

\(\Leftrightarrow0x=0\)( luôn thỏa mãn )

Vậy \(S=ℝ\)với \(x\ne\pm3\)

\(\Leftrightarrow\left(x+2\right)\left(x-2\right)+3\left(x+1\right)=3+x^2-x-2\)

\(\Leftrightarrow x^2-4+3x+3=x^2-x+1\)

=>3x-1=-x+1

=>4x=2

hay x=1/2

\(\frac{x}{x+1}-\frac{2x-3}{x-1}=\frac{2x+3}{x^2-1}\) ĐKXĐ: x ≠ 1; x ≠ -1

⇔x(x - 1) - (2x - 3)(x + 1) = 2x + 3

⇔ x² - x - 2x² + 3x - 2x + 3 = 2x + 3

⇔ -x² - 2x = 0

⇔ -x(x + 2) = 0

⇔ \(\left[{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\) (TM)

Vậy nghiệm của pt là x = 0; x = -2

ĐKXĐ: x≠1; x≠-1

Ta có: \(\frac{x}{x+1}-\frac{2x-3}{x-1}=\frac{2x+3}{x^2-1}\)

\(\Leftrightarrow\frac{x\left(x-1\right)}{\left(x+1\right)\left(x-1\right)}-\frac{\left(2x-3\right)\left(x+1\right)}{\left(x-1\right)\left(x+1\right)}-\frac{2x+3}{\left(x-1\right)\left(x+1\right)}=0\)

\(\Leftrightarrow x^2-x-\left(2x^2+2x-3x-3\right)-\left(2x+3\right)=0\)

\(\Leftrightarrow x^2-x-2x^2+x+3-2x-3=0\)

\(\Leftrightarrow-x^2-2x=0\)

\(\Leftrightarrow-x\left(x+2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x+2=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\)

Vậy: x∈{0;-2}

b) \(\frac{x-3}{x-2}+\frac{x+2}{x-4}=-1\)

\(\Rightarrow\frac{\left(x-3\right)\left(x-4\right)}{\left(x-2\right)\left(x-4\right)}+\frac{\left(x-2\right)\left(x-2\right)}{\left(x-2\right)\left(x-4\right)}=-1\)

\(\Rightarrow\frac{\left(x-3\right)\left(x-4\right)+x^2-4}{\left(x-2\right)\left(x-4\right)}=-1\)

\(\Rightarrow\frac{x^2-7x+12+x^2-4}{\left(x-2\right)\left(x-4\right)}=-1\)

\(\Rightarrow\frac{2x^2-7x+8}{\left(x-2\right)\left(x-4\right)}=-1\)

\(\Rightarrow\frac{2x^2-7x+8}{\left(x-2\right)\left(x-4\right)}=-1\)

.................

a) \(\frac{2}{x-1}+\frac{2x+3}{x^2+x+1}=\frac{\left(2x-1\right)\left(2x+1\right)}{x^3-1}\)

\(\Rightarrow\frac{2\left(x^2+x+1\right)}{\left(x-1\right)\left(x^2+x+1\right)}+\frac{\left(2x+3\right)\left(x-1\right)}{\left(x+1\right)\left(x^2+x+1\right)}=\frac{\left(2x-1\right)\left(2x+1\right)}{x^3-1}\)

\(\Rightarrow\frac{2\left(x^2+x+1\right)+\left(2x+3\right)\left(x-1\right)}{x^3-1}=\frac{\left(2x-1\right)\left(2x+1\right)}{x^3-1}\)

\(\Rightarrow\left(x^3-1\right)\left[2\left(x^2+x+1\right)+\left(2x+3\right)\left(x-1\right)\right]=\left(x^3-1\right)\left(2x-1\right)\left(2x+1\right)\)

\(\Rightarrow2\left(x^2+x+1\right)+\left(2x+3\right)\left(x-1\right)=\left(2x-1\right)\left(2x+1\right)\)

\(\Rightarrow2\left(x^2+x+1\right)+\left(2x+3\right)\left(x-1\right)-\left(2x-1\right)\left(2x+1\right)=0\)

\(\Rightarrow2x^2+2x+2+2x^2-2x+3x-3-\left(4x^2-1\right)=0\)

\(\Rightarrow2x^2+2x+2+2x^2-2x+3x-3-4x^2+1=0\)

\(\Rightarrow3x=0\)

\(\Rightarrow luon-dung-voi-moi-x\)

nhầm phải là

3x=0

=>không có giá trị x thỏa mãn yêu cầu