ghi rõ giupd e vs
a)\(\frac{1}{3}+\frac{1}{2}:x=-4\)
\(\Leftrightarrow\frac{1}{2}:x=-\frac{13}{3}\)
\(\Leftrightarrow x=-\frac{3}{26}\)
b)\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{5}\)
\(\Leftrightarrow\frac{1}{4}:x=-\frac{7}{20}\)
\(\Leftrightarrow x=-\frac{5}{7}\)
#H