Предмет: Алгебра, автор: emirsagynaliev050

срочно помогите кто чем может пожалуйста ​

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Ответы

Автор ответа: NNNLLL54
1

Ответ:

Дробно-рациональные уравнения .

\displaystyle \bf 1)\ \ \frac{x^2-2x}{x+4}=\frac{x-4}{x+4}\ \ \ \Rightarrow \ \ \ \frac{x^2-2x}{x+4}-\frac{x-4}{x+4}=0\ \ ,\\\\\\\frac{x^2-2x-(x+4)}{x+4}=0\ \ ,\ \ \ \frac{x^2-3x-4}{x+4}=0\ \ \ \Rightarrow \\\\\\x^2-3x-4=0\ ,\ \ x\ne -4\\\\D=b^2-4ac=9+16=25\ ,\\\\x_1=-1\ ,\ x_2=4\\\\Otvet:\ x_1=-1\ ,\ x_2=4\ .  

\displaystyle \bf 2)\ \ \frac{x^2-2x}{2x-1}=\frac{4x-3}{1-2x}\ \ \ \Rightarrow \ \ \ \frac{x^2-2x}{2x-1}-\frac{4x-3}{1-2x}=0\ \ ,\\\\\\\frac{x^2-2x}{2x-1}+\frac{4x-3}{2x-1}=0\ \ ,\ \ \ \frac{x^2-2x+4x-3}{2x-1}=0\ \ ,\ \ \frac{x^2+2x-3}{2x-1}=0\ \ ,\\\\\\x^2+2x-3=0\ ,\ \ x\ne \frac{1}{2}\ ,\\\\D=b^2-4ac=4+12=16\ \ ,\\\\x_1=\frac{-2-4}{2}=-3\ \ ,\ \ x_2=\frac{-2+4}{2}=1\\\\\\Otvet:\ x_1=-3\ ,\ \ x_2=1\ .    

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