Question

tìm x biết

    |x|+1/2=3/4

 

Answer 1

lxl+1/2=3/4

=>lxl=3/4-1/2=1/4

=> x=1/4 hoặc x=-1/4

Answer 2

\(TH1:x\ge0\)

\(\Rightarrow x+\frac{1}{2}=\frac{3}{4}\)

\(\Rightarrow x=\frac{3}{4}-\frac{1}{2}\)

\(\Rightarrow x=\frac{1}{4}\)

\(TH2:x< 0\)

\(\Rightarrow-x+\frac{1}{2}=\frac{3}{4}\)

\(\Rightarrow-x=\frac{3}{4}-\frac{1}{2}\)

\(\Rightarrow x=-\frac{1}{4}\)