Đáp án+Giải thích các bước giải:
`•)|x+3/4| -1/2=0`
`=>|x+3/4|=1/2`
`=>`\(\left[ \begin{array}{l}x+3/4=1/2\\x+3/4=-1/2\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=1/2+3/4\\x=-1/2+3/4\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=5/4\\x=1/4\end{array} \right.\)
Vậy...
`b)|x|=3 1/4`
`=>|x|=13/4`
`=>`\(\left[ \begin{array}{l}x=13/4\\x=-13/4\end{array} \right.\)
Vậy....
`c)|x|=1,357`
`=>`\(\left[ \begin{array}{l}x=1,357\\x=-1,357\end{array} \right.\)
Vậy..
