Question

[Thảo Trần]

Giúp mik vs. Mik đang cần gấp ạ!!!

Answer 1

[Lấp La Lấp Lánh]

4) \(\left|\dfrac{5}{18}-x\right|-\dfrac{7}{24}=0\)

\(\Leftrightarrow\left|\dfrac{5}{18}-x\right|=\dfrac{7}{24}\)

\(\Leftrightarrow\left[{}\begin{matrix}\dfrac{5}{18}-x=\dfrac{7}{24}\\\dfrac{5}{18}-x=-\dfrac{7}{24}\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{72}\\x=\dfrac{41}{72}\end{matrix}\right.\)

b) \(\dfrac{2}{5}-\left|\dfrac{1}{2}-x\right|=6\)

\(\Leftrightarrow\left|\dfrac{1}{2}-x\right|=-\dfrac{28}{5}\)( vô lý do \(\left|\dfrac{1}{2}-x\right|\ge0\forall x\))

Vậy \(S=\varnothing\)