Question

x+5/7=5/6=                                 13/21+x=2/3

       giải chi tiết

Answer 1

x = 5/6 - 5/7

x = 5/42

 

x = 2/3 - 13/21

x = 1/21

Answer 2

\(x=\dfrac{5}{6}-\dfrac{5}{7}=\dfrac{5}{42}\)

 

\(x=\dfrac{2}{3}-\dfrac{13}{21}=\dfrac{1}{21}\)

Answer 3

\(1,x+\dfrac{5}{7}=\dfrac{5}{6}\)

\(\Leftrightarrow x=\dfrac{5}{6}-\dfrac{5}{7}\)

\(\Leftrightarrow x=\dfrac{5.7}{42}-\dfrac{5.6}{42}\)

\(\Leftrightarrow x=\dfrac{35}{42}-\dfrac{30}{42}\)

\(\Leftrightarrow x=\dfrac{5}{42}\)

\(2,\dfrac{13}{21}+x=\dfrac{2}{3}\)

\(\Leftrightarrow x=\dfrac{2}{3}-\dfrac{13}{21}\)

\(\Leftrightarrow x=\dfrac{2.7}{21}-\dfrac{13}{21}\)

\(\Leftrightarrow x=\dfrac{14}{21}-\dfrac{13}{21}\)

\(\Leftrightarrow x=\dfrac{1}{21}\)