Question

Nó hơi nghiêng nhưng cố gúp em nha m.n

Answer 1

a: \(\Leftrightarrow2x=\dfrac{4}{5}-\dfrac{1}{2}=\dfrac{8-5}{10}=\dfrac{3}{10}\)

hay x=3/20

b: \(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{1}{4}=\dfrac{7}{2}\\x-\dfrac{1}{4}=-\dfrac{7}{2}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{15}{4}\\x=-\dfrac{13}{4}\end{matrix}\right.\)

c: \(\Leftrightarrow x^3=-216\)

hay x=-6