Question

Answer 1

a) \(x-\dfrac{3}{4}=6\times\dfrac{3}{8}\)

\(x-\dfrac{3}{4}=\dfrac{9}{4}\)

\(x=\dfrac{9}{4}-\dfrac{3}{4}\)

\(x=\dfrac{3}{2}\)

b) \(\dfrac{7}{8}:x=3-\dfrac{1}{2}\)

\(\dfrac{7}{8}:x=\dfrac{5}{2}\)

\(x=\dfrac{7}{8}:\dfrac{5}{2}\)

\(x=\dfrac{7}{20}\)

c) \(\dfrac{5}{6}\times x-2\dfrac{1}{9}=\dfrac{2}{3}\)

\(5\times x-\dfrac{19}{9}=\dfrac{2}{3}\)

\(5\times x=\dfrac{2}{3}+\dfrac{19}{9}\)

\(5\times x=\dfrac{25}{9}\)

\(x=\dfrac{25}{9}:5\)

\(x=\dfrac{5}{9}\)

 

Answer 2

dấu chấm là nhân nha, và làm luôn ko viết đề

\(a,x-\dfrac{3}{4}=\dfrac{9}{4}\\ x=\dfrac{9}{4}+\dfrac{3}{4}\\ x=\dfrac{12}{4}\\ x=3\)

\(b,\dfrac{7}{8}:x=\dfrac{6}{2}-\dfrac{1}{2}\\ \dfrac{7}{8}:x=\dfrac{5}{2}\\ x=\dfrac{7}{8}:\dfrac{5}{2}\\ x=\dfrac{7}{20}\)

\(c,\dfrac{5}{6}\cdot x-\dfrac{19}{9}=\dfrac{2}{3}\\ \dfrac{5}{6}\cdot x=\dfrac{2}{3}+\dfrac{19}{9}\\ \dfrac{5}{6}\cdot x=\dfrac{25}{9}\\ x=\dfrac{25}{9}:\dfrac{5}{6}\\ x=\dfrac{10}{3}\)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer 3

a)x - \(\dfrac{3}{4}\) = \(\dfrac{18}{8}\)             b)\(\dfrac{7}{8}\): x = \(\dfrac{5}{2}\)          

   x     = \(\dfrac{18}{8}\) + \(\dfrac{3}{4}\)                  x =  \(\dfrac{7}{8}\) :  \(\dfrac{5}{2}\)               

  x     = \(\dfrac{24}{8}\)                          x =   \(\dfrac{14}{40}\)

còn câu c ko bt làm