2x-1 trên 3 -x-1 trên 2 + x+1 trên 6 = 1
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\(x-5=\frac{1}{3\left(x+2\right)}\left(đkxđ:x\ne-2\right)\)
\(< =>3\left(x-5\right)\left(x+2\right)=1\)
\(< =>3\left(x^2-3x-10\right)=1\)
\(< =>x^2-3x-10=\frac{1}{3}\)
\(< =>x^2-3x-\frac{31}{3}=0\)
giải pt bậc 2 dễ r
\(\frac{x}{3}+\frac{x}{4}=\frac{x}{5}-\frac{x}{6}\)
\(< =>\frac{4x+3x}{12}=\frac{6x-5x}{30}\)
\(< =>\frac{7x}{12}=\frac{x}{30}< =>12x=210x\)
\(< =>x\left(210-12\right)=0< =>x=0\)
b:
ĐKXĐ: \(x\notin\left\{0;2;-2\right\}\)
\(\left(\dfrac{4}{x^3-4x}+\dfrac{1}{x+2}\right):\left(\dfrac{x-2}{x^2+2x}-\dfrac{x}{2x+4}\right)\)
\(=\left(\dfrac{4}{x\left(x-2\right)\left(x+2\right)}+\dfrac{1}{x+2}\right):\left(\dfrac{x-2}{x\left(x+2\right)}-\dfrac{x}{2\left(x+2\right)}\right)\)
\(=\dfrac{4+x\left(x-2\right)}{x\left(x-2\right)\cdot\left(x+2\right)}:\dfrac{2\left(x-2\right)-x^2}{x\left(x+2\right)\cdot2}\)
\(=\dfrac{x^2-2x+4}{x\left(x-2\right)\left(x+2\right)}\cdot\dfrac{2x\left(x+2\right)}{-\left(x^2-2x+4\right)}\)
\(=\dfrac{-2}{x-2}\)
c:ĐKXĐ: x<>0
\(\left(x-\dfrac{3}{x}\right):\left(\dfrac{x^2+2x+1}{x}-\dfrac{2x+4}{x}\right)\)
\(=\dfrac{x^2-3}{x}:\dfrac{x^2+2x+1-2x-4}{x}\)
\(=\dfrac{x^2-3}{x}\cdot\dfrac{x}{x^2-3}\)
=1
a, \(\frac{x+1}{2x+6}+\frac{2x+3}{x^2+3x}=\frac{x+1}{2\left(x+3\right)}+\frac{3x+2}{x\left(x+3\right)}\)
\(=\frac{x^2+x}{2x\left(x+3\right)}+\frac{6x+4}{2x\left(x+3\right)}=\frac{x^2+7x+4}{2x\left(x+3\right)}\)
b, Sua de : \(\frac{3}{2x+6}-\frac{x-6}{2x^2+6x}=\frac{3}{2\left(x+3\right)}-\frac{x-6}{2x\left(x+3\right)}\)
\(=\frac{3x}{2x\left(x+3\right)}-\frac{x-6}{2x\left(x+3\right)}=\frac{2x+6}{2x\left(x+3\right)}=\frac{1}{x}\)
a) |x-2|=|2x-1|
=> x-2=2x-1 hoặc x-2=-2x-1
=> x-2x=1+2 hoặc x+2x=-1+2
=> x=-3 hoặc 1x=-1
mik chỉ bt làm câu này thôi xin lỗi nhé!!! Nhớ k cho mik nếu bạn cảm thấy đúng### cho mik kết bạn vs bạn nha???
1: \(\Leftrightarrow x^2+6x+9-6x+3>x^2-4x\)
=>-4x<12
hay x>-3
2: \(\Leftrightarrow6+2x+2>2x-1-12\)
=>8>-13(đúng)
4: \(\dfrac{2x+1}{x-3}\le2\)
\(\Leftrightarrow\dfrac{2x+1-2x+6}{x-3}< =0\)
=>x-3<0
hay x<3
6: =>(x+4)(x-1)<=0
=>-4<=x<=1
\(\frac{2x-1}{3}-\frac{x-1}{2}+\frac{x+1}{6}=1\)
<=> \(\frac{2x}{3}-\frac{1}{3}-\frac{x}{2}+\frac{1}{2}+\frac{x}{6}+\frac{1}{6}=1\)
<=> \(\frac{2}{3}x-\frac{1}{2}x+\frac{1}{6}x=1+\frac{1}{3}-\frac{1}{2}-\frac{1}{6}\)
<=> \(x\left(\frac{2}{3}-\frac{1}{2}+\frac{1}{6}\right)=\frac{2}{3}\)
<=> \(x\cdot\frac{1}{3}=\frac{2}{3}\)
<=> x = 2
\(\frac{2x-1}{3}-\frac{x-1}{2}+\frac{x+1}{6}=1\)
<=> \(\frac{2\left(2x-1\right)}{6}-\frac{3\left(x-1\right)}{6}+\frac{x+1}{6}=1\)
<=> \(\frac{4x-2-3x+1+x+1}{6}=1\)
<=> 2x = 6
<=> x = 3
Vậy x = 3 là nghiệm phương trình