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28 tháng 3 2020

\(\frac{x+1}{x-1}-\frac{x-1}{x+1}=\frac{-16}{1-x^2}\left(x\ne\pm1\right)\)

\(\Leftrightarrow\frac{x+1}{x-1}-\frac{x-1}{x+1}+\frac{16}{1-x^2}=0\)

\(\Leftrightarrow\frac{x+1}{x-1}-\frac{x-1}{x+1}-\frac{16}{\left(x-1\right)\left(x+1\right)}=0\)

\(\Leftrightarrow\frac{\left(x+1\right)^2}{\left(x-1\right)\left(x+1\right)}-\frac{\left(x-1\right)^2}{\left(x-1\right)\left(x+1\right)}-\frac{16}{\left(x-1\right)\left(x+1\right)}=0\)

\(\Leftrightarrow\frac{x^2+2x+1-x^2+2x-1-16}{\left(x-1\right)\left(x+1\right)}=0\)

\(\Leftrightarrow\frac{4x-16}{\left(x-1\right)\left(x+1\right)}=0\)

=> 4x-16=0

<=> 4x=16

<=> x=4 (tmđk)

Vậy x=4

1 tháng 3 2022

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\(M=\left(\dfrac{x-x^2}{\left(x-1\right)^2}+\dfrac{1}{1+x}-\dfrac{x}{x-1}\right)\cdot\left(\dfrac{3x-1}{x}+\dfrac{1}{x+1}-1\right)\)

\(=\left(\dfrac{-x}{x-1}-\dfrac{x}{x-1}+\dfrac{1}{x+1}\right)\cdot\dfrac{\left(3x-1\right)\left(x+1\right)+x-x\left(x+1\right)}{x\left(x+1\right)}\)

\(=\dfrac{-2x\left(x+1\right)+x-1}{\left(x-1\right)\left(x+1\right)}\cdot\dfrac{3x^2+2x-1+x-x^2-x}{x\left(x+1\right)}\)

\(=\dfrac{-2x^2-2x+x-1}{\left(x-1\right)\left(x+1\right)}\cdot\dfrac{2x^2+2x-1}{x\left(x+1\right)}\)

\(=\dfrac{-2x^2-x-1}{\left(x-1\right)\left(x+1\right)}\cdot\dfrac{2x^2+2x-1}{x\left(x+1\right)}\)

\(=\dfrac{\left(-2x^2-x-1\right)\left(2x^2+2x-1\right)}{x\left(x+1\right)^2\cdot\left(x-1\right)}\)

14 tháng 4 2023

\(\left(\dfrac{3x-1}{x+1}-1\right)\)bạn sửa lại đề bào thế này

 

10 tháng 9 2019

\(P:\frac{4x-2-16}{2x+1}=\frac{4x^2+4x+1}{x-2}\)

\(\Rightarrow P=\frac{4x^2+4x+1}{x-2}.\frac{4x^2-16}{2x+1}\)

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

 \(\Rightarrow P=4.\left(2x+1\right).\left(x+2\right)\)

\(=4.\left(2x^2+x+4x+2\right)\)

\(8x^2+40x+8\)

Chúc bạn học tốt !!!

\(M=\dfrac{x-x^2}{1-x^2}+\dfrac{1}{1+x}\cdot\dfrac{3x-1}{x+1}-1\)

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

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

\(=\dfrac{2x-2}{\left(x+1\right)^2}\)

12 tháng 4 2023

đề yêu cầu gì vậy bạn

 

23 tháng 7 2021

a) \(x^2-\frac{1}{49}=0\)

<=> \(\left(x-\frac{1}{7}\right)\left(x+\frac{1}{7}\right)=0\)

<=> \(\orbr{\begin{cases}x-\frac{1}{7}=0\\x+\frac{1}{7}=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{7}\\x=-\frac{1}{7}\end{cases}}\)

Vậy x = \(\pm\frac{1}{7}\)

b) \(64-\frac{1}{4}x^2=0\)

<=> \(\left(8-\frac{1}{2}x\right)\left(8+\frac{1}{2}x\right)=0\)

<=> \(\orbr{\begin{cases}8-\frac{1}{2}x=0\\8+\frac{1}{2}x=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=16\\x=-16\end{cases}}\)

Vậy \(x=\pm16\)

c) 9x2 + 12x + 4 = 0

<=> (3x + 2)2 = 0

<=> 3x + 2 = 0 

<=> x = -2/3

Vậy x = -2/3

e) \(x^2+\frac{1}{4}=x\) 

<=> \(x^2-x+\frac{1}{4}=0\)

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

<=> \(x=\frac{1}{2}\)

Vậy \(x=\frac{1}{2}\)

23 tháng 7 2021

d, sửa đề : \(x^2+4=4x\Leftrightarrow x^2-4x+4=0\Leftrightarrow\left(x-2\right)^2=0\Leftrightarrow x=2\)

i, \(4-\frac{12}{x}+\frac{9}{x^2}=0\)ĐK : \(x\ne0\)

Vì \(x\ne0\)Nhân 2 vế với \(x^2\)phương trình có dạng 

\(4x^2-12x+9=0\Leftrightarrow\left(2x-3\right)^2=0\Leftrightarrow x=\frac{3}{2}\)

a: =>(x-2)(3x+1)-(x-2)(x+2)=0

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

=>(x-2)(2x-1)=0

=>x=1/2 hoặc x=2

b: =>3(x-1)+4(x+1)=6(x-1)

=>3x-3+4x+4=6x-6

=>7x+1=6x-6

=>x=-7

c: =>x(x-3)-(x+2)(x+3)+16=0

=>x^2-3x-x^2-5x-6+16=0

=>10-8x=0

=>x=5/4