Question

Cứu mình với 3h mình phải nộp rồi 👉👈😓😢

Answer 1

\(\dfrac{2}{5}+\dfrac{3}{7}\)
 

\(=\dfrac{14}{35}+\dfrac{15}{35}\)
 

\(=\dfrac{29}{35}\)

 

 

\(3+\dfrac{2}{5}\)
 

\(=\dfrac{15}{5}+\dfrac{2}{5}\)
 

\(=\dfrac{17}{5}\)

 

 

\(\dfrac{5}{7}-\dfrac{1}{6}\)
 

\(=\dfrac{30}{42}-\dfrac{7}{42}\)
 

\(=\dfrac{23}{42}\)

 

 

\(\dfrac{14}{3}-3\)

\(=\dfrac{14}{3}-\dfrac{9}{3}\)
 

\(=\dfrac{5}{3}\)

 

 

\(\dfrac{5}{6}\times\dfrac{4}{3}\)
 

\(=\dfrac{20}{18}\)  \(=\dfrac{10}{9}\)

 

 

\(5\times\dfrac{8}{15}\)
 

\(=\dfrac{40}{15}\) \(=\dfrac{8}{3}\)

 

 

\(\dfrac{4}{9}:5\)

\(=\dfrac{4}{9}\times\dfrac{1}{5}\)
 

\(=\dfrac{4}{45}\)

 

 

\(\dfrac{6}{5}:\dfrac{5}{6}\)
 

\(=\dfrac{6}{5}\times\dfrac{6}{5}\)
 

\(=\dfrac{36}{25}\)