b)  \(\frac{2\left(x+1\right)}{3x^2+x}+\frac{13\left(x+1\right)}{3x^2+x+6\left(x+1\right)}=6\)  (1)

Đặt  \(a=x+1;b=3x^2+x\)  thì

\(\left(1\right)\Leftrightarrow\frac{2a}{b}+\frac{13a}{b+6a}=6\)

\(\Leftrightarrow4a^2-7ab-2b^2=0\)

\(\Leftrightarrow\left(a-2b\right)\left(4a+b\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}a=2b\\a=-\frac{1}{4}b\end{cases}}\)

Đến đây thì dễ rồi

a) \(\frac{1}{x+2}+\frac{2}{x+3}=\frac{6}{x+4}\)

ĐKXĐ \(x\ne-2,-3,-4\)

=> \(\frac{1}{x+2}+\frac{2}{x+3}-\frac{6}{x+4}=0\)

=> \(\frac{3x+7}{\left(x+2\right)\left(x+3\right)}-\frac{6}{x+4}=0\)

=> \(\frac{\left(3x+7\right)\left(x+4\right)-6\left(x+2\right)\left(x+3\right)}{\left(x+2\right)\left(x+3\right)\left(x+4\right)}=0\)

=> (3x + 7)(x + 4) - 6(x² + 5x + 6) = 0

=> 3x² + 19x + 28 - 6x² - 30x - 36 = 0

=> -3x² - 11x - 8 = 0

=> -3x² - 3x - 8x - 8 = 0

=> -3x(x + 1) - 8(x + 1) = 0

=> (x + 1)(-3x - 8) = 0

=> \(\orbr{\begin{cases}x=-1\\x=-\frac{8}{3}\end{cases}}\)

Vậy ...

b) Thiếu dữ liệu cuả đề 

c) \(\frac{6x+22}{x+2}-\frac{2x+7}{x+3}=\frac{x+4}{x^2+5x+6}\)

ĐKXĐ \(x\ne-2;-3\)

=> \(\frac{\left(6x+22\right)\left(x+3\right)-\left(x+2\right)\left(2x+7\right)}{\left(x+2\right)\left(x+3\right)}=\frac{x+4}{\left(x+2\right)\left(x+3\right)}\)

=> \(6x^2+40x+66-x\left(2x+7\right)-2\left(2x+7\right)=x+4\)

=> \(6x^2+40x+66-2x^2-7x-4x-14=x+4\)

=> 4x² + 29x + 52 = x + 4

=> 4x² + 29x + 52 - x - 4 = 0

=> 4x² + 28x + 48 = 0

=> 4(x² + 7x + 12) = 0

=> x² + 7x +12 = 0

=> x² + 3x + 4x + 12 = 0

=> x(x + 3) + 4(x + 3) = 0

=> (x + 3)(x + 4) = 0

=> \(\orbr{\begin{cases}x=-3\\x=-4\end{cases}}\) 

Mà \(x\ne-2,-3\)nên x = -3 loại

Vậy x = -4

\(\left(x+4\right)^2\)nhấn lộn.mn giúp đỡ

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

\(\Leftrightarrow8\left(x+\frac{1}{x}\right)^2-8\left(x^2+\frac{1}{x^2}\right)=\left(x+2\right)^2\)

\(\Leftrightarrow8\left(x^2+\frac{1}{x^2}+2\right)-8\left(x^2+\frac{1}{x^2}\right)=\left(x+2\right)^2\)

\(\Leftrightarrow\left(x+2\right)^2=16\)

\(\Rightarrow\left[{}\begin{matrix}x=2\\x=-6\end{matrix}\right.\)

ĐKXĐ: \(x\ne0\)

Ta có \(\left(x+\frac{1}{x}\right)^2=x^2+\frac{1}{x^2}+2\)

Đặt \(x^2+\frac{1}{x^2}=a\Rightarrow\left(x+\frac{1}{x}\right)^2=a+2\) pt trở thành:

\(8\left(a+2\right)+4a^2-4a\left(a+2\right)=\left(x+4\right)^2\)

\(\Leftrightarrow8a+16+4a^2-4a^2-8a=\left(x+4\right)^2\)

\(\Leftrightarrow\left(x+4\right)^2=16\)

\(\Rightarrow\left[{}\begin{matrix}x+4=4\\x+4=-4\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=0\left(l\right)\\x=-8\end{matrix}\right.\)

Ko có vế phải à bạn?

thêm =0 vào vế trái nha

Tự cho đkxđ nha!!!

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

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

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

Suy ra: x + 1 + x - 3 - 2x = 0

<=> -2 = 0 (Vô lý)

Vậy pt vô nghiệm

ĐK: \(x\in R\backslash\left\{-4,-3,-2,-1\right\}\)

PT ban đầu

\(\Leftrightarrow\frac{x+2-x-1}{\left(x+1\right)\left(x+2\right)}+\frac{x+3-x-2}{\left(x+2\right)\left(x+3\right)}+\frac{x+4-x-3}{\left(x+3\right)\left(x+4\right)}+\frac{x+5-x-4}{\left(x+4\right)\left(x+5\right)}=\frac{1}{x+1}-403\\ \Leftrightarrow\frac{1}{x+1}-\frac{1}{x+2}+\frac{1}{x+2}-\frac{1}{x+3}+\frac{1}{x+3}-\frac{1}{x+4}+\frac{1}{x+4}-\frac{1}{x+5}=\frac{1}{x+1}-403\\ \Leftrightarrow\frac{1}{x+5}=403\\ \Leftrightarrow x+5=\frac{1}{403}\Leftrightarrow x=\frac{-2014}{403}\)

Chúc bạn học tốt nha.

Ta có : \(\frac{2}{2x-6}+\frac{1}{x+2}+\frac{2.x}{\left(x+1\right).\left(3-x\right)}=0\)

ĐKXĐ : x \(\ne\)-1 ; x \(\ne\)-2 ; x \(\ne\)3

MTC : ( x + 1 ) . ( x+ 2 ) . ( x - 3 ) 

<=> ( x + 1 ) . ( x + 2 ) + ( x + 1 ) . ( x + 3 ) - 2.x. ( x + 2 ) = 0

<=> x² + x + 2.x + 2 + x² -3.x + x -3 - 2.x² -4.x               = 0

<=> -3.x                                                                             = 1

<=> x = \(\frac{-1}{3}\)

Vậy S = { ​​​\(\frac{-1}{3}\)​}

ĐKXĐ: x khác 3, x khác -1

\(\frac{2}{2x-6}+\frac{2}{2x+2}+\frac{2}{\left(x+1\right)\left(3-x\right)}=0\)

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

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

<=> \(\frac{-2x+4}{\left(3-x\right)\left(x+1\right)}=0\)

<=> -2x+4=0

<=>x=-2

vậy ....