Question

Answer 1

\(\dfrac{2}{3}x=\dfrac{1}{8}+\dfrac{4}{7}=\dfrac{7+28}{35}=1\Leftrightarrow x=\dfrac{3}{2}\)

\(\dfrac{8}{9}x=\dfrac{2}{7}-\dfrac{2}{3}=\dfrac{6-14}{21}=\dfrac{-8}{21}\Leftrightarrow x=-\dfrac{9}{21}=-\dfrac{3}{7}\)

Answer 2

$1.$ 

Phương trình ban đầu tương đương:

$x=\left ( \frac{1}{8}+\frac{4}{7} \right ):\frac{2}{3}=\frac{117}{112}$

$2.$

Phương trình ban đầu tương đương:

$ x=\left ( \frac{2}{3}-\frac{2}{7} \right ):-\frac{8}{9}=-\frac{3}{7}$