a) m/n = 7/6 - 2/3
m/n = 1/2
b) m/n = 9/7 - 2/5
m/n = 31/35
c) m/n = 8/9 : 3
m/n = 8/27
d) m/n = 14/19 : 42/38
m/n = 2/3
a. m/n =7/6 - 2/3
m/n = 1/2
b. m/n =9/7 - 2/5
m/n = 1/35
c.m/n =8/9 : 3
m/n =8/27
d. m/n = 14/19 : 42/38
m/n = 2/3
\(a,\dfrac{7}{6}-\dfrac{m}{n}=\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{7}{6}-\dfrac{2}{3}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{7}{6}-\dfrac{4}{6}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{3}{6}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{1}{2}\)
\(b,\dfrac{2}{5}+\dfrac{m}{n}=\dfrac{9}{7}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{9}{7}-\dfrac{2}{5}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{45}{35}-\dfrac{14}{35}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{31}{35}\)
\(c,\dfrac{m}{n}\times3=\dfrac{8}{9}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{8}{9}:3\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{8}{9}\times\dfrac{1}{3}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{8}{27}\)
\(d,\dfrac{14}{19}:\dfrac{m}{n}=\dfrac{42}{38}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{14}{19}:\dfrac{42}{38}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{14}{19}\times\dfrac{38}{42}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{532}{798}\)
\(\Leftrightarrow\dfrac{m}{n}=\dfrac{2}{3}\)
a) m/n = 7/6 - 2/3
m/n = 1/2
b) m/n = 9/7 - 2/5
m/n = 31/35
c) m/n = 8/9 : 3
m/n = 8/27
d) m/n = 14/19 : 42/38
m/n = 2/3
a. m/n =7/6 - 2/3
m/n = 1/2
b. m/n =9/7 - 2/5
m/n = 1/35
c.m/n =8/9 : 3
m/n =8/27
d. m/n = 14/19 : 42/38
m/n = 2/3
