Đáp án:
Giải thích các bước giải:
c)
| x-55% | = $\dfrac{7}{15}$
| x - $\dfrac{11}{20}$ | = $\dfrac{7}{15}$
x - $\dfrac{11}{20}$ = ± $\dfrac{7}{15}$
\(\left[ \begin{array}{l}x-\dfrac{11}{20}=\dfrac{7}{5}\\x-\dfrac{11}{20}=\dfrac{-7}{5}\end{array} \right.\)
\(\left[ \begin{array}{l}x=\dfrac{7}{5}+\dfrac{11}{20}\\x=\dfrac{-7}{5}+\dfrac{11}{20}\end{array}\right.\)
\(\left[ \begin{array}{l}x=\dfrac{39}{20}\\x=\dfrac{-17}{20}\end{array} \right.\)
