Question

Tìm x :

a)1/4 + x =5/2 * 8/7                             b) 7/3 - x =11/5 : 5/6                        c) 23/6 : x - 2/5 = 1/4

Answer 1

a)

 

\(\frac{1}{4}\)+x=\(\frac{5}{2}\)*\(\frac{8}{7}\)

\(\frac{1}{4}\)+x=\(\frac{20}{7}\)

      x=\(\frac{20}{7}\)-\(\frac{1}{4}\)

      x=\(\frac{73}{28}\)

 

b)

 

\(\frac{7}{3}\)-x=\(\frac{11}{5}\):\(\frac{5}{6}\)

\(\frac{7}{3}\)-x=\(\frac{66}{25}\)

     x=\(\frac{66}{25}\)+\(\frac{7}{3}\)

     x=\(\frac{373}{75}\)

c)

 

\(\frac{23}{6}\):x-\(\frac{2}{5}\)=\(\frac{1}{4}\)

\(\frac{23}{6}\):x     =\(\frac{1}{4}\)+\(\frac{2}{5}\)

\(\frac{23}{6}\):x     =\(\frac{13}{20}\)

       x     =\(\frac{23}{6}\):\(\frac{13}{20}\)

       x     =\(\frac{269}{60}\).

Answer 2

x + 13 = 34

x         = 34 - 13

x          = 21

Vậy x = 21