Question

Tìm x thuộc z , biết:

\(\frac{x^2}{-5}\)= \(\frac{25}{x}\)

Answer 1

\(\Leftrightarrow\hept{\begin{cases}x^2=25\\-5=x\end{cases}}\)

\(\Rightarrow x=\sqrt{25}=-5\)ko thể =5 vì -5=x

Answer 2

25/5 -x*2/2

Answer 3

tìm x thuộc z , biết:

    \(\frac{45}{x+1}\)= \(\frac{10.\left(x+1\right)}{2}\)

Answer 4

\(\frac{x^2}{-5}\)\(=\) \(\frac{25}{x}\)

\(x^2\)\(\times\)\(x\)\(=\)   \(25\)\(\times\)\(\left(-5\right)\)

\(x\) \(\times\)\(x\)\(\times\)\(x\)\(=\)  \(-125\)

\(x^3\)\(=\)\(-125\)

\(x^3\)\(=\)\(-5^3\)

\(\Rightarrow\)\(x\)\(=\)\(-5\)