Đáp án:
Giải thích các bước giải:
$-\dfrac{3}{4}-|\dfrac{4}{5}-x|=-1$
$(=)|\dfrac{4}{5}-x|=-\dfrac{3}{4}-(-1)$
$(=)|\dfrac{4}{5}-x|=\dfrac{1}{4}$
\(\left[ \begin{array}{l}\dfrac{4}{5}-x=\dfrac{1}{4}\\\dfrac{4}{5}-x=-\dfrac{1}{4}\end{array} \right.\)
(=)\(\left[ \begin{array}{l}x=\dfrac{11}{20}\\x=\dfrac{21}{20}\end{array} \right.\)
$|\dfrac{5}{2}+x|-(-\dfrac{2}{3})=3$
$(=)|\dfrac{5}{2}+x|+\dfrac{2}{3}=3$
$(=)|\dfrac{5}{2}+x|=\dfrac{7}{3}$
\(\left[ \begin{array}{l}\dfrac{5}{2}+x=\dfrac{7}{3}\\\dfrac{5}{2}+x=-\dfrac{7}{3}\end{array} \right.\) (=)\(\left[ \begin{array}{l}x=-\dfrac{1}{6}\\x=-\dfrac{29}{6}\end{array} \right.\)
Chúc bạn học tốt.
