Question

tìm x biết

a.\(\left|x\right|-\dfrac{3}{4}=0\)

b. \(\dfrac{3}{4}+\dfrac{2x}{5}=\dfrac{29}{60}\)

Answer 1

a ) \(\left|x\right|-\dfrac{3}{4}=0\)

\(\Leftrightarrow\left|x\right|=\dfrac{3}{4}\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3}{4}\\x=-\dfrac{3}{4}\end{matrix}\right.\)

Vậy ............

b ) \(\dfrac{3}{4}+\dfrac{2x}{5}=\dfrac{29}{60}\)

\(\Leftrightarrow\dfrac{45}{60}+\dfrac{24x}{60}=\dfrac{29}{60}\)

\(\Leftrightarrow45+24x=29\)

\(\Leftrightarrow x=-\dfrac{2}{3}.\)

Vậy..