Question

Tìm x,y,z biết

\(\frac{1-x}{4}=\frac{-9}{x-1}\)

Answer 1

        \(\frac{1-x}{4}=\frac{-9}{x-1}\)

\(\Rightarrow\)\(\left(1-x\right)\left(x-1\right)=\left(-9\right).4\)

\(\Leftrightarrow\)\(-\left(x-1\right)^2=-36\)

\(\Leftrightarrow\)\(\left(x-1\right)^2=36\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}x-1=6\\x-1=-6\end{cases}}\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}x=7\\x=-5\end{cases}}\)

Vậy....

Answer 2

Còn câu này nữa:

\(\frac{18}{5}x=\frac{9}{2}y=\frac{6}{11}z\) và \(-x+z=-196\)