Question

2 tìm x

a,x-2/7=4/5x15/24

b,x:2/7=9/8-15/6

 

Answer 1

a, \(x\) - \(\dfrac{2}{7}\) = \(\dfrac{4}{5}\) \(\times\) \(\dfrac{15}{24}\)

    \(x\) - \(\dfrac{2}{7}\) = \(\dfrac{1}{2}\)

    \(x\)        = \(\dfrac{1}{2}\) + \(\dfrac{2}{7}\)

    \(x\)       = \(\dfrac{11}{14}\)

b, \(x\): \(\dfrac{2}{7}\) = \(\dfrac{9}{8}\) - \(\dfrac{15}{6}\)

     \(x\):  \(\dfrac{2}{7}\) = - \(\dfrac{11}{8}\)

     \(x\)      = - \(\dfrac{11}{8}\) \(\times\) \(\dfrac{2}{7}\)

     \(x\)     = - \(\dfrac{11}{28}\)

Answer 2

a) x = 11/14

b) x = -11/28

Answer 3

\(a,\) \(x\) \(-\) \(\dfrac{2}{7}\) \(=\dfrac{4}{5}\times\dfrac{15}{24}\)

   \(x-\dfrac{2}{7}=\dfrac{1}{2}\)

  \(x\)          \(=\) \(\dfrac{1}{2}+\dfrac{2}{7}\)

 \(x\)           \(=\) \(\dfrac{11}{14}\)

\(b,\) \(x\div\dfrac{2}{7}=\dfrac{9}{8}-\dfrac{15}{6}\)                                               

\(x\div\dfrac{2}{7}=\dfrac{87}{24}\)

\(x=\dfrac{87}{24}\times\dfrac{2}{7}\)

\(x=\dfrac{87}{84}\)