Giai phương trình\(\dfrac{x+1}{x-1}-\dfrac{x-1}{x+1}+\dfrac{x^2+3x-2}{1-x^2}=0\)
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22 tháng 3 2023
a: =>4(2x-1)-12x=3(x+3)+24
=>8x-4-12x=3x+9+24
=>-4x-4=3x+33
=>-7x=37
=>x=-37/7
b: =>(x-2)(x+2+x-9)=0
=>(2x-7)(x-2)=0
=>x=2 hoặc x=7/2
c: =>(x-1)(x+3)-x+3=3x+3
=>x^2+2x-3-x+3=3x+3
=>x^2+x-3x-3=0
=>x^2-2x-3=0
=>(x-3)(x+1)=0
=>x=-1
28 tháng 8 2021
a: Ta có: \(3x-\left(3x+2\right)=x+3\)
\(\Leftrightarrow x+3=-2\)
hay x=-5
b: Ta có: \(\dfrac{5x-1}{4}+\dfrac{2x-1}{3}=\dfrac{3x}{2}\)
\(\Leftrightarrow15x-3+8x-4=18x\)
\(\Leftrightarrow5x=7\)
hay \(x=\dfrac{7}{5}\)
NA
19 tháng 3 2022
a,\(\left(3x-2\right)\left(x+3\right)=9x^2-4\\ \Leftrightarrow\left(3x-2\right)\left(x+3\right)-\left(3x-2\right)\left(3x+2\right)=0\\ \Leftrightarrow\left(3x-2\right)\left(x+3-3x-2\right)=0\\ \Leftrightarrow\left(3x-2\right)\left(-2x+1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=\dfrac{1}{2}\end{matrix}\right.\)
b, ĐKXĐ:\(x\ne\pm2\)
\(\dfrac{x-4}{x+2}-\dfrac{x+1}{x-2}=\dfrac{24}{x^2-4}\\ \Leftrightarrow\dfrac{\left(x-4\right)\left(x-2\right)}{\left(x-2\right)\left(x+2\right)}-\dfrac{\left(x+1\right)\left(x+2\right)}{\left(x-2\right)\left(x+2\right)}-\dfrac{24}{\left(x-2\right)\left(x+2\right)}=0\\ \Leftrightarrow\dfrac{x^2-6x+8-x^2-3x-2-24}{\left(x-2\right)\left(x+2\right)}=0\\ \Rightarrow-9x-18=0\\ \Leftrightarrow x=-2\left(ktm\right)\)
S
18 tháng 3 2021
1,\(3x-1=0\Leftrightarrow3x=-1\Leftrightarrow x=-\dfrac{1}{3}\)
2,\(2-x=3x+1\Leftrightarrow2-1=3x+x\rightarrow1=4x\Rightarrow x=-\dfrac{1}{4}\)
S
18 tháng 3 2021
3,\(2\left(x-2\right)-1=5x\Leftrightarrow2x-4-1=5x\Leftrightarrow2x-5x=4+1\Rightarrow3x=5\Rightarrow x=\dfrac{5}{3}\)
4,\(\dfrac{x}{3}-\dfrac{x}{5}=4\Leftrightarrow\dfrac{5x}{15}-\dfrac{3x}{15}=\dfrac{60}{15}\Rightarrow5x-3x=60\Rightarrow2x=60\Rightarrow x=\dfrac{60}{2}=30\)
8 tháng 2 2021
1) ĐKXĐ: \(x\notin\left\{2;-2\right\}\)
Ta có: \(\dfrac{1-6x}{x-2}+\dfrac{9x+4}{x+2}=\dfrac{x\left(3x-2\right)+1}{x^2-4}\)
\(\Leftrightarrow\dfrac{\left(1-6x\right)\left(x+2\right)}{\left(x-2\right)\left(x+2\right)}+\dfrac{\left(9x+4\right)\left(x-2\right)}{\left(x+2\right)\left(x-2\right)}=\dfrac{3x^2-2x+1}{\left(x-2\right)\left(x+2\right)}\)
Suy ra: \(\left(1-6x\right)\left(x+2\right)+\left(9x+4\right)\left(x-2\right)=3x^2-2x+1\)
\(\Leftrightarrow x+2-6x^2-12x+9x^2-18x+4x-8-3x^2+2x-1=0\)
\(\Leftrightarrow-23x-7=0\)
\(\Leftrightarrow-23x=7\)
\(\Leftrightarrow x=-\dfrac{7}{23}\)(nhận)
Vậy: \(S=\left\{-\dfrac{7}{23}\right\}\)
2) ĐKXĐ: \(x\notin\left\{\dfrac{2}{3};-\dfrac{2}{3}\right\}\)
Ta có: \(\dfrac{3x+2}{3x-2}-\dfrac{6}{2-3x}=\dfrac{9x^2}{9x^2-4}\)
\(\Leftrightarrow\dfrac{3x+2}{3x-2}+\dfrac{6}{3x-2}=\dfrac{9x^2}{\left(3x-2\right)\left(3x+2\right)}\)
\(\Leftrightarrow\dfrac{3x+8}{3x-2}=\dfrac{9x^2}{\left(3x-2\right)\left(3x+2\right)}\)
\(\Leftrightarrow\dfrac{\left(3x+8\right)\left(3x+2\right)}{\left(3x-2\right)\left(3x+2\right)}=\dfrac{9x^2}{\left(3x-2\right)\left(3x+2\right)}\)
Suy ra: \(9x^2+6x+24x+16=9x^2\)
\(\Leftrightarrow30x+16=0\)
\(\Leftrightarrow30x=-16\)
hay \(x=-\dfrac{8}{15}\)(nhận)
Vậy: \(S=\left\{-\dfrac{8}{15}\right\}\)
21 tháng 2 2021
a)\(x\in R\)
b)\(x\ne1\)
c) \(x\notin\left\{1;2\right\}\)
d) \(x\notin\left\{3;-3\right\}\)
e) \(x\ne1\)
f) \(x\notin\left\{2;3\right\}\)
HP
9 tháng 5 2022
a. \(x-\dfrac{x+2}{3}< 3x+\dfrac{x}{2}+5\)
\(\Leftrightarrow\dfrac{6x}{6}-\dfrac{2\left(x+2\right)}{6}< \dfrac{18x}{6}+\dfrac{3x}{6}+\dfrac{30}{6}\)
\(\Rightarrow6x-2x-4-18x-3x-30< 0\)
\(\Leftrightarrow-17x< 34\)
\(\Leftrightarrow x>-2\)
b. \(\dfrac{x}{2}+\dfrac{1-x}{3}>0\)
\(\Leftrightarrow3x+2-2x>0\)
\(\Leftrightarrow x>-2\)
c. \(\left(x-9\right)^2-x\left(x+9\right)< 0\)
\(\Leftrightarrow x^2-18x+81-x^2-9x< 0\)
\(\Leftrightarrow-27x< -81\)
\(\Leftrightarrow x>3\)
22 tháng 3 2021
a) ĐKXĐ: \(x\ne3\)
Ta có: \(\dfrac{x^2-x-6}{x-3}=0\)
\(\Leftrightarrow\dfrac{\left(x+2\right)\left(x-3\right)}{x-3}=0\)
Suy ra: x+2=0
hay x=-2(thỏa ĐK)
Vậy: S={-2}
22 tháng 3 2021
d)
ĐKXĐ: \(x\notin\left\{1;3\right\}\)
Ta có: \(\dfrac{x+5}{x-1}=\dfrac{x+1}{x-3}-\dfrac{8}{x^2-4x+3}\)
\(\Leftrightarrow\dfrac{\left(x+5\right)\left(x-3\right)}{\left(x-1\right)\left(x-3\right)}=\dfrac{\left(x+1\right)\left(x-1\right)}{\left(x-3\right)\left(x-1\right)}-\dfrac{8}{\left(x-1\right)\left(x-3\right)}\)
Suy ra: \(x^2-3x+5x-15=x^2-1-8\)
\(\Leftrightarrow2x-15+9=0\)
\(\Leftrightarrow2x-6=0\)
hay x=3(loại)
Vậy: \(S=\varnothing\)
ĐKXĐ:\(x\ne\pm1\)
\(\dfrac{x+1}{x-1}-\dfrac{x-1}{x+1}+\dfrac{x^2+3x-2}{1-x^2}=0\\ \Leftrightarrow\dfrac{\left(x+1\right)^2}{\left(x+1\right)\left(x-1\right)}-\dfrac{\left(x-1\right)^2}{\left(x+1\right)\left(x-1\right)}-\dfrac{x^2+3x-2}{\left(x+1\right)\left(x-1\right)}=0\\ \Leftrightarrow\dfrac{x^2+2x+1-x^2+2x-1-x^2-3x+2}{\left(x+1\right)\left(x-1\right)}=0\\ \Rightarrow-x^2+x+2=0\\ \Leftrightarrow x^2-x-2=0\\ \Leftrightarrow\left(x^2-2x\right)+\left(x-2\right)=0\\ \Leftrightarrow x\left(x-2\right)+\left(x-2\right)=0\\ \Leftrightarrow\left(x+1\right)\left(x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=-1\left(ktm\right)\\x=2\left(tm\right)\end{matrix}\right.\)
\(ĐK:x\ne\pm1\)
\(\Leftrightarrow\dfrac{\left(x+1\right)\left(x+1\right)-\left[\left(x-1\right)\left(x-1\right)\right]-\left(x^2+3x-2\right)}{\left(x-1\right)\left(x+1\right)}=0\)
\(\Leftrightarrow\left(x+1\right)^2-\left(x-1\right)^2-\left(x^2+3x-2\right)=0\)
\(\Leftrightarrow x^2+2x+1-x^2+2x-1-x^2-3x+2=0\)
\(\Leftrightarrow-x^2-x+2=0\)
\(\Leftrightarrow-x^2+x-2x+2=0\)
\(\Leftrightarrow-x\left(x-1\right)-2\left(x-1\right)=0\)
\(\Leftrightarrow\left(x-1\right)\left(x+2\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\left(ktm\right)\\x=-2\left(tm\right)\end{matrix}\right.\)