9/4 - y . 5/6 = 1/2 +2/3
9/4 - y . 5/6 = 7/6
9/4 - y = 7/6 : 5/6
9/4 - y = 7/5
y = 9/4 - 7/5
y = 17/20
\(\frac{9}{4}-y\times\frac{5}{6}=\frac{1}{2}+\frac{2}{3}\)
\(\frac{9}{4}-y\times\frac{5}{6}=\frac{7}{6}\)
\(y\times\frac{5}{6}=\frac{9}{4}-\frac{7}{6}\)
\(y\times\frac{5}{6}=\frac{13}{12}\)
\(y=\frac{13}{12}:\frac{5}{6}\)
\(y=\frac{13}{10}\)
Toan Nhung Thang Thong Minh Nhat VIET NAM