Bạn tham khảo!
$a)$ $\dfrac{1}{3}$ $+$ $\dfrac{4}{3}$ $.$ $x$ $=$ $2.5$
$→$ $\dfrac{4}{3}$ $.$ $x$ $=$ $2.5$ $-$ $\dfrac{1}{3}$
$→$ $\dfrac{4}{3}$ $.$ $x$ $=$ $\dfrac{13}{6}$
$→$ $x$ $=$ $\dfrac{13}{6}$ $:$ $\dfrac{4}{3}$
$→$ $x$ $=$ $\dfrac{13}{8}$
$b)$ $|$ $x$ $+$ $\dfrac{1}{5}$ $|$ $-$ $\dfrac{1}{3}$ $=$ $4$
$→$ $|$ $x$ $+$ $\dfrac{1}{5}$ $|$ $=$ $4$ $+$ $\dfrac{1}{3}$
$→$ $|$ $x$ $+$ $\dfrac{1}{5}$ $|$ $=$ $\dfrac{13}{3}$
$→$ $x$ $+$ $\dfrac{1}{5}$ $=$ $\dfrac{13}{3}$ và $x$ $+$ $\dfrac{1}{5}$ $=$ $\dfrac{-13}{3}$
$→$ $x$ $=$ $\dfrac{13}{3}$ $-$ $\dfrac{1}{5}$ và $x$ $=$ $\dfrac{-13}{3}$ $-$ $\dfrac{1}{5}$
$→$ $x$ $=$ $\dfrac{62}{15}$ và $x$ $=$ $\dfrac{-68}{15}$
$FbBinhne2k88$
