\(\dfrac{2x-5}{3}=\dfrac{x+2}{2}\) help em vs mn ơi
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ĐK: ` x\ne \pm 3`
`(x+1)/(x-3)+(x-1)/(x+3)=(x+6)/(x^2-9)`
`<=>(x+1)(x+3)+(x-1)(x-3)=x+6`
`<=>x^2+4x+3+x^2-4x+3=x+6`
`<=>2x^2+6=x+6`
`<=>2x^2-x=0`
`<=>x(2x-1)=0`
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{1}{2}\end{matrix}\right.\)
Vậy `S={0; 1/2}`.
ĐKXĐ: x ≠ -3, x ≠ 3
\(\dfrac{x+1}{x-3}+\dfrac{x-1}{x+3}=\dfrac{x+6}{x^2-9}\)
\(\Leftrightarrow\dfrac{\left(x+1\right)\left(x+3\right)+\left(x-1\right)\left(x-3\right)}{\left(x-3\right)\left(x+3\right)}=\dfrac{x+6}{\left(x-3\right)\left(x+3\right)}\)
\(\Rightarrow x^2+4x+3+x^2-4x+3=x+6\)
\(\Leftrightarrow2x^2-x=0\)
\(\Leftrightarrow x\left(2x-1\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\left(tm\right)\\x=\dfrac{1}{2}\left(tm\right)\end{matrix}\right.\)
Vậy...
![](https://rs.olm.vn/images/avt/0.png?1311)
`(3x+2)/3 <= (x-4)/7`
`<=>7(3x+2) <= 3(x-4)`
`<=> 21x+14<=3x-12`
`<=>18x <= -26`
`<=> x <=-13/9`
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
`(3x+2)/3 <= (x-4)/7`
`<=>7(3x+2) <= 3(x-4)`
`<=>21x+14 <= 3x-12`
`<=> 18x <=-26`
`<=>x <= -13/9`
Vậy `x<=-13/9`.
![](https://rs.olm.vn/images/avt/0.png?1311)
Mik thấy ở vế đầu tiên nó hình như bạn bị nhầm thì phải :\(\dfrac{2X}{2X+Y}-\dfrac{3Y}{2X-Y}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(\left(\dfrac{1}{3}-2x\right)^{2018}\ge0\forall x\);
\(\left(3y-x\right)^{2020}\ge0\forall x;y\)
=> \(\left(\dfrac{1}{3}-2x\right)^{2018}+\left(3y-x\right)^{2020}\ge0\)
mà theo đề thì:\(\left(\dfrac{1}{3}-2x\right)^{2018}+\left(3y-x\right)^{2020}\le0\)
=> Dấu ''='' xảy ra khi và chỉ khi: \(\left\{{}\begin{matrix}\dfrac{1}{3}-2x=0\\3y-x=0\end{matrix}\right.\)
Ta có: \(\dfrac{1}{3}-2x=0\Rightarrow x=\dfrac{1}{6}\);
\(3y-x=0\Leftrightarrow3y-\dfrac{1}{6}=0\Leftrightarrow3y=\dfrac{1}{6}\Leftrightarrow y=\dfrac{1}{18}\)
=> \(\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{1}{\dfrac{1}{6}}+\dfrac{1}{\dfrac{1}{18}}=6+18=24\left(đpcm\right)\)
\(\left(2x-5\right).2=\left(x+2\right).3\)
\(\Rightarrow4x-10=3x+6\)
\(\Rightarrow x=16\)
\(\dfrac{2x+5}{3}=\dfrac{x+2}{2}\)
MTC : 6
Quy đồng mẫu thức :
\(\Rightarrow\) \(\dfrac{2\left(2x+5\right)}{6}=\)\(\dfrac{3\left(x+2\right)}{6}\)
Suy ra : 2(2x + 5) = 3(x + 2)
\(\Leftrightarrow\) 4x + 10 = 3x + 6
\(\Leftrightarrow\) 4x + 10 - 3x - 6 = 0
\(\Leftrightarrow\) x + 4 = 0
\(\Leftrightarrow\) x = - 4
Vậy S = \(\left\{-4\right\}\)
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