Question

[Nguyễn Quang Huy]

Timf x,y:

8/5=-12/x

x-1/-4=-4/x-1

-2/x=y/4

4/y+2=7/3y+1

2x-1/3=3x+!/4

Answer 1

[Tran Le Khanh Linh]

\(\frac{8}{5}=\frac{-12}{x}\left(x\ne0\right)\)\(\Leftrightarrow8x=-60\)\(\Leftrightarrow x=\frac{-60}{8}=\frac{-15}{2}\)(tmđk)

\(\frac{x-1}{-4}=\frac{-4}{x-1}\left(x\ne1\right)\)\(\Leftrightarrow\left(x-1\right)^2=16\)\(\Leftrightarrow\orbr{\begin{cases}x-1=4\\x-1=-4\end{cases}\Leftrightarrow\orbr{\begin{cases}x=5\left(tm\right)\\x=-3\left(tm\right)\end{cases}}}\)

Answer 2

[Hoàng hôn ( Cool Team )]

\(\frac{8}{5}=\frac{-12}{x}\)

\(\Rightarrow8x=-60\)

        \(x=-60:8\)

        \(x=-7,5\)

Vậy x=-7,5

\(\frac{x-1}{-4}=\frac{-4}{x-1}\)

\(\Rightarrow\left(x-1\right)^2=16\)

     \(\left(x-1\right)^2=4^2\)

 \(\Rightarrow\orbr{\begin{cases}x-1=4\\x-1=-4\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=4+1=5\\x=-4+1=-3\end{cases}}\)

vậy x=5 hoặc x=-3