\(\left\{{}\begin{matrix}9x-3y=-12\\2x+3y=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}11x=-11\\y=3x+4\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-1\\y=1\end{matrix}\right.\)

Ta có a - b + c = 1 + 1 - 2 = 0 

Vậy pt có 2 nghiệm 

x = -1 ; x = 2 

x2 - x - 2 = 0
<=>x2 + x - 2x -2 = 0
<=> x ( x + 1 ) - 2 ( x + 1 ) = 0 
<=> ( x - 2 ) ( x + 1 ) = 0
<=>-- x - 2 = 0
      -- x + 1 = 0
<=>-- x = 2
      -- x = - 1
  Vậy S = { 2 ; -1 }

đk x >= 1 

\(x-\sqrt{x-1}=9\Leftrightarrow x-9=\sqrt{x-1}\)

\(\Leftrightarrow x^2-18x+81=x-1\Leftrightarrow x^2-19x+82=0\)

\(\Leftrightarrow x=\dfrac{19+\sqrt{33}}{2}\left(tm\right);x=\dfrac{19-\sqrt{33}}{2}\left(tm\right)\)

Minh hasn't given his friends his old books since he moved to Cu Chi.

Ba hasn't ridden his bike for 3 months. 

đk x khác 0 ; 4 

\(\dfrac{1}{\sqrt{x}\left(\sqrt{x}-2\right)}-\dfrac{2}{x-4}=\dfrac{\sqrt{x}+2-2\sqrt{x}}{\sqrt{x}\left(x-4\right)}=\dfrac{2-\sqrt{x}}{\sqrt{x}\left(x-4\right)}=\dfrac{-1}{\sqrt{x}\left(\sqrt{x}+2\right)}\)

đk x >= 0 ; x khác 1/4 

Ta có \(^{P=\dfrac{5\sqrt{x}}{2\sqrt{x}+1}+\dfrac{1}{2\sqrt{x}+1}}=\dfrac{5\sqrt{x}+1}{2\sqrt{x}+1}\)

\(\Rightarrow5\sqrt{x}+1⋮2\sqrt{x}+1\Leftrightarrow10\sqrt{x}+2⋮2\sqrt{x}+1\)

\(\Leftrightarrow5\left(2\sqrt{x}+1\right)-3⋮2\sqrt{x}+1\Rightarrow2\sqrt{x}+1\inƯ\left(-3\right)=\left\{\pm1;\pm3\right\}\)

Hoành độ giao điểm (P) ; (d) tm pt 

\(x^2-\left(m-2\right)x-3=0\)

\(\Delta=\left(m-2\right)^2-4\left(-3\right)=\left(m-2\right)^2+12>0\)

Vậy (P) cắt (d) tại 2 điểm pb 

Theo Vi et \(\left\{{}\begin{matrix}x_1+x_2=m-2\left(1\right)\\x_1x_2=-3\left(2\right)\end{matrix}\right.\)

Vì \(x_1x_2=-3< 0\)nên pt có 2 nghiệm trái dấu 

đk : \(\left\{{}\begin{matrix}x_1< 0\\x_2>0\end{matrix}\right.\)

\(-x_1=3x_2\Leftrightarrow x_1+3x_2=0\)(3) 

Từ (1) ; (3) \(\left\{{}\begin{matrix}x_1+x_2=m-2\\x_1+3x_2=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2x_2=-\left(m-2\right)\\x_1=m-2-x_2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x_2=\dfrac{-\left(m-2\right)}{2}\\x_1=\dfrac{2m-4+m-2}{2}=\dfrac{3m-6}{2}\end{matrix}\right.\)

Thay vào (2) ta được \(\dfrac{-3\left(m-2\right)^2}{4}=-3\Leftrightarrow\left(m-2\right)^2=4\Leftrightarrow\left[{}\begin{matrix}m=4\\m=0\end{matrix}\right.\)

ĐKXĐ : \(x;y\ne0\)

Khi đó \(\left\{{}\begin{matrix}x-\dfrac{1}{x}=y-\dfrac{1}{y}\\2x^2-xy=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x-y=-\dfrac{x-y}{xy}\\2x^2-xy=1\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}\left(x-y\right)\left(\dfrac{xy+1}{xy}\right)=0\\2x^2-xy=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}x=y\\xy=-1\end{matrix}\right.\\2x^2-xy=1\end{matrix}\right.\)

Với x = y thì 2x² - xy  = 1

<=> 2x² - x² = 1

<=> x² = 1

<=> x = \(\pm1\) (tm) 

Khi x = -1 => y = -1

x = 1 => y = 1

Với xy = - 1 thì 2x² - xy = 1

<=> 2x² - (-1) = 1

<=> x² = 0

<=> x = 0 (ktm) 

Vậy hệ có 2 nghiệm (x;y) = (1; 1) ; (-1 ; -1)