Question

tìm x thuộc Q:

/x/=2,1

/x/=17/9 va x<0

/x/=1/2/5

/x/=0,35 va x >0

 

Answer 1

x= +- 2,1

x= - 17/9

x= +- 1/2/5

x= 0,35

Answer 2

\(\left|x\right|=2,1\)

\(\Rightarrow x=+_-2,1\)

\(\left|x\right|=\frac{17}{9}vax< 0\)

\(\Rightarrow x=-\frac{17}{9}\)

\(\left|x\right|=\frac{1}{\frac{2}{5}}=\frac{5}{2}\)

\(\Rightarrow x=+_-2,5\)

\(\left|x\right|=0,35vax>0\)

\(\Rightarrow x=0,35\)