\(\frac{x}{-4}=\frac{-16}{x}\)
\(\Rightarrow x\cdot x=-16\cdot\left(-4\right)\)
\(\Rightarrow x^2=64\)
\(\Rightarrow x^2=\left(\pm8\right)^2\)
\(\Rightarrow x=\pm8\)
a)\(\left(x-\frac{5}{8}\right).\frac{5}{18}=-\frac{15}{36}\)
\(\Rightarrow x-\frac{5}{8}=\frac{-15}{36}.\frac{18}{5}\)
\(\Rightarrow x-\frac{5}{8}=-\frac{3}{2}\)
\(\Rightarrow x=-\frac{12}{8}+\frac{5}{8}=-\frac{7}{8}\)
b)\(\frac{x}{-4}=\frac{-16}{x}\)
\(\Rightarrow x^2=64\)
\(\Rightarrow x=\orbr{\begin{cases}8\\-8\end{cases}}\)
\(\left(x-\frac{5}{8}\right)\frac{5}{18}=-\frac{15}{36}\)
\(\Leftrightarrow\frac{5}{18}x-\frac{25}{144}=-\frac{15}{36}\)
\(\Leftrightarrow\frac{5}{18}x=-\frac{35}{144}\)
\(\Leftrightarrow x=-\frac{7}{8}\)
X/-4 = -16/X
vì x và x = -4 x -16 nên x và x = 64
suy ra 64 : -4 =-16 nên x/-4 = -16/4
64 : -16 = -4 nên 16/x = 16/-4
k nha mk biết mỗi câu thui
